GM Service Manual Online
For 1990-2009 cars only

DTC

Descriptor

DTC 011

 

DTC 012

 

DTC 013

 

DTC 021

 

DTC 022

 

DTC 023

 

DTC 031

 

DTC 032

 

DTC 033

 

DTC B0004

In Park Switch Circuit High

DTC B0008

Right Front/Passenger Frontal Deployment Loop Circuit

DTC B0012, B0013, B0014, B0016, B0017, or B0018

Right Front/Driver Side Deployment Loop Circuit

DTC B0016, B0017, or B0018

Left Front/Driver Frontal Deployment Loop Circuit

DTC B0022, B0024, B0026, B0042, B0043, or B0044

Left Front/Driver Frontal Deployment Loop (Stage 1) Circuit

DTC B0022, B0024, or B0026

Right Front/Driver Side Deployment Loop Circuit

DTC B0028, B0029, or B0030

Left Front/Driver Side Deployment Loop Circuit

DTC B0040, B0041, or B0045

Deployment Commanded

DTC B0051

Deployment Commanded With Loop Faults Present

DTC B0053

Left Front/Driver Side Impact Sensor (SIS) Circuit

DTC B0057, B0058, or B0059

Electronic Front End Sensor Circuit

DTC B0064, B0065, or B0066

Passenger Compartment Temperature Sensor 1 Circuit

DTC B0077, B0078, B0079, B0080, B0081, or B0082

Air Mix Door Circuit Range

DTC B0100, B0101, B0102, B0103, B0104, or B0105

Temperature Control Circuit

DTC B0165 or B0166

ECU Malfunction

DTC B0233

Option Configuration Error

DTC B0408 or B0418

Loss of Keep Alive Memory

DTC B1000

EEPROM Write Error

DTC B1001

EEPROM Checksum Error

DTC B1004

Audio Output Circuit

DTC B1007

Device Power Circuit Low

DTC B1009

Device Power Circuit High

DTC B1025, B1035, B1045, or B1055

Device Ground 1 Circuit Open

DTC B1259

Device Ground 2 Circuit Open

DTC B1327

Device Ignition 0 (Unlock/On/Start) Circuit Open

DTC B1328

Device Voltage Reference Output 1 Circuit Low

DTC B1349

Device Voltage Reference Output 1 Circuit High

DTC B1354

Power Mode Master Input Circuits Mismatch

DTC B1369

Retained Accessory Power Circuit Low

DTC B1397

Retained Accessory Power Circuit High

DTC B1398

Battery Rundown Protection Circuit Low

DTC B1440

High Power Control Circuit

DTC B1477

Mirror Switch Circuit

DTC B1478

Outside Rear View Mirror Vertical or Horizontal Position Sensor Circuit

DTC B1482

Outside Rear View Mirror Motor Circuit

DTC B1507 or B1508

Power Seat Switch Circuit

DTC B1560, B1565, B1570, or B1575

Seat Motor(s) Overcurrent

DTC B1580, B1590, B1610, or B1620

Theft Lock Enabled

DTC B1600, B1605, B1630, or B1635

Power Seat Position Sensor Circuit

DTC B1735, B1740, B1745, B1750, B1755, B1760, B1815, or B1820

Cellular Phone Microphone Circuit

DTC B1770, B1775, B1780, B1785, B1790, B1805, or B2415

Cellular Phone Antenna Circuit

DTC B1780

Cellular Phone Select Service Switch

DTC B1825, B1850, B2355, B2365, or B2375

Cellular Phone Select Service Switch Range/Performance

DTC B2455

Global Positioning System (GPS) Sensor Circuit

DTC B2462

Fog Lamps Control Circuit Low

DTC B2470

Fog Lamps Control Circuit High

DTC B2476

Headlamp Control Circuit Low

DTC B2482

HeadLamp Control Circuit High

DTC B2483 or B2484

Park Lamp Control Circuit Low

DTC B2532

Park Lamp Control Circuit High

DTC B2533

Daytime Running Lamp Control 1 Circuit Low

DTC B2577

Daytime Running Lamp Control 1 Circuit High

DTC B2578

Passenger Compartment Dimming 1 Circuit High

DTC B2587

Passenger Compartment Dimming 2 Circuit Low

DTC B2588

Passenger Compartment Dimming 2 Circuit High

DTC B2602

Display Dimming PWM Output Circuit Low

DTC B2603

Display Dimming PWM Output Circuit High

DTC B2613

Ambient Light Sensor Circuit High

DTC B2617

Ambient Light Sensor Circuit Low

DTC B2618

Ambient Light Sensor Circuit High

DTC B2627

Park Lamp Switch Circuit High

DTC B2628

Trunk Release Switch Circuit Low

DTC B2645

Fog Lamp Switch Circuit Low

DTC B2647

Traction Control Switch Circuit Low

DTC B2648

Horn Relay Coil Circuit Low

DTC B2665

Memory Select Switch Circuit

DTC B2732

Driver Information Center (DIC) Switch Circuit

DTC B2742

Driver Information Center (DIC) Switch Circuit

DTC B2747

Invalid Coded Key Is Present

DTC B2752

Key in Ignition Circuit Malfunction

DTC B2755 or B2760

Key Decoder Device in Assembly Learn Mode

DTC B2823 or B3574

Key Not Present

DTC B2838, B3564, B3569, or B3752

Door Lock Key Switch Signal Circuit

DTC B2960

Keyless Entry Data Link Circuit Range/Performance

DTC B2961

Keyless Entry Data Link Circuit Low

DTC B3031

Keyless Entry Data Link Circuit High

DTC B3055

Keyless Entry Data Link Parity Error

DTC B3064 or B3069

RF/LF Door Lock/Unlock Switch Circuit Malfunction

DTC B3101

RF/LF Door Lock/Unlock Switch Circuit Low

DTC B3102

Cargo Door/Liftgate Unlock Request Circuit Malfunction

DTC B3103

Park Lamp Signal Circuit Low

DTC B3106

Park Lamp Signal Circuit High

DTC B3270

Headlamp High Beam Signal Circuit Malfunction

DTC B3272

A/C Evaporator Temperature Sensor Circuit

DTC B3826

Wheel Speed Sensor Circuit

DTC B3840

EBCM Internal Solenoid Circuit

DTC B3841

Pump Motor Malfunction

DTC B3857

Valve Relay Circuit Malfunction

DTC B3933

EBCM Internal Solenoid Circuit

DTC C0035-C0051

ABS/TCS Brake Switch Circuit Malfunction

DTC C0060-C0095

TCS RPM Signal Circuit Malfunction

DTC C0110

PCM Traction Control Not Allowed

DTC C0121

PCM Indicated Requested Torque Malfunction

DTC C0141-C0156

PWM Delivered Torque Malfunction

DTC C0161

Wheel Speed Sensor Frequency Error

DTC C0236

ECU Malfunction

DTC C0240

VIN Information Error

DTC C0241 or P0856

Device Voltage Range Performance

DTC C0244 or P1689

Low Tire Pressure Detected

DTC C0245

HO2S Heater Control Circuit Sensor 1

DTC C0550

Mass Air Flow (MAF) Sensor Performance

DTC C0565

Mass Air Flow (MAF) Sensor Circuit Low Frequency

DTC C0896

Mass Air Flow (MAF) Sensor Circuit High Frequency

DTC P0008

Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage

DTC P0009

Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage

DTC P0010, P0013, P0020, or P0023

Intake Air Temperature (IAT) Sensor Circuit Low Voltage

DTC P0011, P0014, P0021, or P0024

Intake Air Temperature (IAT) Sensor Circuit High Voltage

DTC P0016, P0017, P0018, or P0019

Engine Coolant Temperature (ECT) Sensor Performance

DTC P0030

Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage

DTC P0030 or P0036

Engine Coolant Temperature (ECT) Sensor Circuit High Voltage

DTC P0031 or P0037

Throttle Position (TP) Sensor Performance

DTC P0032 or P0038

Throttle Position (TP) Sensor Circuit Low Voltage

DTC P0053

Throttle Position (TP) Sensor Circuit High Voltage

DTC P0101

Engine Coolant Temperature (ECT) Insufficient for Closed Loop Fuel Control

DTC P0102

Engine Coolant Temperature (ECT) Below Thermostat Regulating Temperature

DTC P0103

HO2S Circuit Closed Loop (CL) Performance Sensor 1

DTC P0107

HO2S Circuit Low Voltage Sensor 1

DTC P0108

HO2S Circuit High Voltage Sensor 1

DTC P0112

HO2S Slow Response Sensor 1

DTC P0113

HO2S Circuit Insufficient Activity Sensor 1

DTC P0116

HO2S Heater Performance Sensor 1

DTC P0117

HO2S Circuit Low Voltage Sensor 2

DTC P0118

HO2S Circuit High Voltage Sensor 2

DTC P0121

HO2S Circuit Insufficient Activity Sensor 2

DTC P0122

HO2S Heater Performance Sensor 2

DTC P0123

Fuel Trim System Lean

DTC P0125

Fuel Trim System Rich

DTC P0128

Injector Control Circuit

DTC P0130

Transmission Fluid Overtemperature

DTC P0131

Fuel Pump Relay Control Circuit

DTC P0132

Engine Misfire Detected

DTC P0133

Knock Sensor (KS) Module Performance

DTC P0134

Crankshaft Position (CKP) Sensor Circuit

DTC P0135

Camshaft Position (CMP) Sensor Circuit

DTC P0136

Exhaust Gas Recirculation (EGR) Flow Insufficient

DTC P0137

Exhaust Gas Recirculation (EGR) Solenoid Control Circuit

DTC P0138

Exhaust Gas Recirculation (EGR) Open Position Performance

DTC P0140

Exhaust Gas Recirculation (EGR) Position Sensor Circuit Low Voltage

DTC P0141

Catalyst System Low Efficiency

DTC P0171

Evaporative Emission (EVAP) System

DTC P0172

Evaporative Emission (EVAP) System Small Leak Detected

DTC P0201-P0206

Evaporative Emission (EVAP) Purge Solenoid Control Circuit

DTC P0218

Evaporative Emission (EVAP) Vent System Performance

DTC P0221

Evaporative Emission (EVAP) Vent Solenoid Control Circuit

DTC P0222

Fuel Tank Pressure (FTP) Sensor Circuit Low Voltage

DTC P0223

Fuel Tank Pressure (FTP) Sensor Circuit High Voltage

DTC P0230

Fuel Level Sensor Circuit Low Voltage

DTC P0261, P0264, P0267, P0270, P0273, or P0276

Fuel Level Sensor Circuit High Voltage

DTC P0262, P0265, P0268, P0271, P0274, or P0277

Cooling Fan Relay Control Circuit

DTC P0300

Vehicle Speed Sensor (VSS) Circuit Low Voltage

DTC P0301-P0306

Vehicle Speed Sensor (VSS) Circuit Intermittent

DTC P0315

Idle Speed Low

DTC P0318

Idle Speed High

DTC P0324

Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit

DTC P0325

System Voltage

DTC P0327

ECU Malfunction

DTC P0327 or P0332

Generator Performance

DTC P0328 or P0333

Malfunction Indicator Lamp [MIL] Control Circuit

DTC P0335

Transmission Fluid Temperature (TFT) Sensor Performance

DTC P0336

Transmission Fluid Temperature (TFT) Sensor Circuit Low Voltage

DTC P0338

Transmission Fluid Temperature (TFT) Sensor Circuit High Voltage

DTC P0341

Input Speed Sensor Performance

DTC P0341, P0346, P0366, or P0391

Input Speed Sensor Circuit Low Voltage

DTC P0342, P0347, P0367, or P0392

Brake Switch Circuit Low Voltage

DTC P0343, P0348, P0368, or P0393

Brake Switch Circuit High Voltage

DTC P0351-P0356

Incorrect Gear Ratio

DTC P0401

Exhaust Gas Recirculation (EGR) Flow Insufficient

DTC P0403

Exhaust Gas Recirculation (EGR) Solenoid Control Circuit

DTC P0404

Exhaust Gas Recirculation (EGR) Open Position Performance

DTC P0405

Exhaust Gas Recirculation (EGR) Position Sensor Circuit Low Voltage

DTC P0420

Catalyst System Low Efficiency

DTC P0442

Evaporative Emission (EVAP) System Small Leak Detected

DTC P0443

Evaporative Emission (EVAP) Purge Solenoid Control Circuit

DTC P0446

Evaporative Emission (EVAP) Vent System Performance

DTC P0449

Evaporative Emission (EVAP) Vent Solenoid Control Circuit

DTC P0452

Fuel Tank Pressure (FTP) Sensor Circuit Low Voltage

DTC P0453

Fuel Tank Pressure (FTP) Sensor Circuit High Voltage

DTC P0455

Evaporative Emission (EVAP) System Large Leak Detected

DTC P0458

Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage

DTC P0459

Engine Coolant Temperature (ECT) Sensor Circuit Intermittent High Voltage

DTC P0461

Throttle Position (TP) Sensor Circuit Intermittent High Voltage

DTC P0462

Throttle Position (TP) Sensor Circuit Intermittent Low Voltage

DTC P0463

HO2S Insufficient Switching Sensor 1

DTC P0480, P0481, P0691, P0692, P0693, or P0694

HO2S Transition Time Ratio Sensor 1

DTC P0496

Engine Oil Pressure (EOP) Switch Circuit

DTC P0498

Crankshaft Position (CKP) System Variation Not Learned

DTC P0499

Ignition Control (IC) Circuit High Voltage

DTC P0502

Ignition Bypass Circuit High Voltage

DTC P0503

Ignition Control (IC) Circuit Low Voltage

DTC P0504

Ignition Bypass Circuit Low Voltage

DTC P0506

Crankshaft Position (CKP) High to Low Resolution Frequency Correlation

DTC P0506 or P0507

Misfire Detected - Rough Road Data Not Available

DTC P0507

Misfire Detected - No Communication With Brake Control Module

DTC P0520

Exhaust Gas Recirculation (EGR) Closed Position Performance

DTC P0521

Evaporative Emission (EVAP) System Flow During Non-Purge

DTC P0522

Air Conditioning (A/C) Clutch Relay Control Circuit

DTC P0523

Cruise Control Feedback Circuit

DTC P0530

Cruise Control Inhibit Output Circuit

DTC P0530, P0532, or P0533

Theft Deterrent Fuel Enable Signal Lost

DTC P0560

Theft Deterrent Learn Mode Active

DTC P0562

Theft Deterrent Fuel Enable Signal Not Correct

DTC P0563

5 Volt Reference 1 Circuit

DTC P0567

5 Volt Reference 2 Circuit

DTC P0568

Control Module Output A Circuit

DTC P0601, P0602, P0603, or P0604

Control Module Output B Circuit

DTC P0601-P0607, P1600, P1621, P1627, P1680, P1681, P1683, or P2610

Control Module Output C Circuit

DTC P0615

Control Module Output D Circuit

DTC P0616

Maximum Adapt and Long Shift

DTC P0617

Torque Converter Overstressed

DTC P0620

Internal Mode Switch-No Start/Wrong Range

DTC P0625

Internal Mode Switch A Circuit Low Voltage

DTC P0626

Internal Mode Switch B Circuit High Voltage

DTC P0627

Internal Mode Switch P Circuit Low Voltage

DTC P0628

Internal Mode Switch-Invalid Range

DTC P0629

Internal Mode Switch C Circuit High Voltage

DTC P0638

Torque Converter Clutch (TCC) PWM Solenoid Control Circuit

DTC P0641

Torque Converter Clutch (TCC) Release Switch Circuit

DTC P0645

Class 2 Communication Malfunction

DTC P0645, P0646, or P0647

Lost Communication with XXX

DTC P0650

Class 2 Data Link Shorted

DTC P0651

Inter-Device Dedicated Bus Malfunction

DTC P0700

Transmission Control Module (TCM) Requested MIL Illumination

DTC P0711

Transmission Fluid Temperature (TFT) Sensor Performance

DTC P0712

Transmission Fluid Temperature (TFT) Sensor Circuit Low Voltage

DTC P0713

Transmission Fluid Temperature (TFT) Sensor Circuit High Voltage

DTC P0716

Input Speed Sensor Performance

DTC P0717

Input Speed Sensor Circuit Low Voltage

DTC P0719

Brake Switch Circuit Low Voltage

DTC P0722

Output Speed Sensor Circuit Low Voltage

DTC P0723

Output Speed Sensor Circuit Intermittent

DTC P0724

Brake Switch Circuit High Voltage

DTC P0730

Incorrect Gear Ratio

DTC P0741

Torque Converter Clutch (TCC) System-Stuck Off

DTC P0742

Torque Converter Clutch (TCC) System-Stuck On

DTC P0748

Pressure Control (PC) Solenoid Control Circuit

DTC P0751

1-2 Shift Solenoid (SS) Valve Performance - No First or Fourth Gear

DTC P0752

1-2 Shift Solenoid (SS) Valve Performance - No Second or Third Gear

DTC P0753

1-2 Shift Solenoid (SS) Control Circuit

DTC P0756

2-3 Shift Solenoid (SS) Valve Performance - No First or Second Gear

DTC P0757

2-3 Shift Solenoid (SS) Valve Performance - No Third or Fourth Gear

DTC P0758

2-3 Shift Solenoid (SS) Control Circuit

DTC P0850

Park/Neutral Position (PNP) Switch Circuit

DTC P0864

Transmission Control Module (TCM) Communication Performance

DTC P0961

Line Pressure Control (PC) Solenoid System Performance

DTC P0973

Shift Solenoid (SS) 1 Control Circuit Low Voltage

DTC P0974

Shift Solenoid (SS) 1 Control Circuit High Voltage

DTC P0976

Shift Solenoid (SS) 2 Control Circuit Low Voltage

DTC P0977

Shift Solenoid (SS) 2 Control Circuit High Voltage

DTC P1011-P1014

Camshaft Position (CMP) Actuator Park Position

DTC P1106

Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent High Voltage

DTC P1107

Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent Low Voltage

DTC P1111

Intake Air Temperature (IAT) Sensor Circuit Intermittent High Voltage

DTC P1112

Intake Air Temperature (IAT) Sensor Circuit Intermittent Low Voltage

DTC P1114

Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage

DTC P1115

Engine Coolant Temperature (ECT) Sensor Circuit Intermittent High Voltage

DTC P1121

Throttle Position (TP) Sensor Circuit Intermittent High Voltage

DTC P1122

Throttle Position (TP) Sensor Circuit Intermittent Low Voltage

DTC P1133

HO2S Insufficient Switching Sensor 1

DTC P1134

HO2S Transition Time Ratio Sensor 1

DTC P1258

Engine Coolant Overtemperature - Protection Mode Active

DTC P1351

Ignition Coil Control Circuit High Voltage

DTC P1352

Ignition Coil 2 Control Circuit High Voltage

DTC P1361

Ignition Coil Control Circuit Low Voltage

DTC P1362

Ignition Coil 2 Control Circuit Low Voltage

DTC P1374

Crankshaft Position (CKP) High to Low Resolution Frequency Correlation

DTC P1380

Misfire Detected - Rough Road Data Not Available

DTC P1381

Misfire Detected - No Communication With Brake Control Module

DTC P1404

Exhaust Gas Recirculation (EGR) Closed Position Performance

DTC P1551

Throttle Valve Rest Position Not Reached During Learn

DTC P1554

Cruise Control Feedback Circuit

DTC P1585

Cruise Control Inhibit Output Circuit

DTC P1621

Control Module Long Term Memory Performance

DTC P1626

Theft Deterrent Start Enable Signal Lost

DTC P1629

Theft Deterrent Start Enable Signal Not Received

DTC P1630

Theft Deterrent Learn Mode Active

DTC P1631

Theft Deterrent Start Enable Signal Not Correct

DTC P1640

Control Module Output Circuit

DTC P1650

Control Module Output B Circuit

DTC P1660

High Idle Lamp Control Circuit

DTC P1668

Generator L-Terminal Control Circuit

DTC P1670

Control Module Output D Circuit

DTC P167A

Control Module HO2S Bank 1 Sensor 1 System Performance

DTC P1811

Maximum Adapt And Long Shift

DTC P1814

Torque Converter Overstressed

DTC P1819

Internal Mode Switch-No Start/Wrong Range

DTC P1820

Internal Mode Switch A Circuit Low Voltage

DTC P1822

Internal Mode Switch B Circuit High Voltage

DTC P1823

Internal Mode Switch P Circuit Low Voltage

DTC P1825

Internal Mode Switch-Invalid Range

DTC P1826

Internal Mode Switch C Circuit High Voltage

DTC P1845

Torque Limit Management

DTC P1860

Torque Converter Clutch (TCC) Pulse Width Modulation (PWM) Solenoid Control Circuit

DTC P1887

Torque Converter Clutch (TCC) Release Switch Circuit

DTC P2008

Intake Manifold Runner Control (IMRC) Solenoid Control Circuit

DTC P2009

Intake Manifold Runner Control (IMRC) Solenoid Control Circuit Low Voltage

DTC P2010

Intake Manifold Runner Control (IMRC) Solenoid Control Circuit High Voltage

DTC P2088, P2090, P2092, or P2094

Camshaft Position (CMP) Actuator Solenoid Control Circuit Low Voltage

DTC P2089, P2091, P2093, or P2095

Camshaft Position (CMP) Actuator Solenoid Control Circuit High Voltage

DTC P2096

Post Catalyst Fuel Trim System Low Limit

DTC P2097

Post Catalyst Fuel Trim System High Limit

DTC P2100

Throttle Actuator Control (TAC) Motor Control Circuit

DTC P2101

Control Module Throttle Actuator Position Performance

DTC P2105

Throttle Actuator Control (TAC) System - Forced Engine Shutdown

DTC P2107

Throttle Actuator Control (TAC) Module Internal Circuit

DTC P2119

Throttle Closed Position Performance

DTC P2122

Accelerator Pedal Position (APP) Sensor 1 Circuit Low Voltage

DTC P2123

Accelerator Pedal Position (APP) Sensor 1 Circuit High Voltage

DTC P2127

Accelerator Pedal Position (APP) Sensor 2 Circuit Low Voltage

DTC P2128

Accelerator Pedal Position (APP) Sensor 2 Circuit High Voltage

DTC P2138

Accelerator Pedal Position (APP) Sensor 1-2 Correlation

DTC P2176

Minimum Throttle Position Not Learned

DTC P2177

Fuel Trim System Lean at Cruise or Accel Bank 1

DTC P2178

Fuel Trim System Rich at Cruise or Accel Bank 1

DTC P2187

Fuel Trim System Lean at Idle Bank 1

DTC P2188

Fuel Trim System Rich at Idle Bank 1

DTC P2195

HO2S Signal Biased Lean Bank 1 Sensor 1

DTC P2196

HO2S Signal Biased Rich Bank 1 Sensor 1

DTC P2228

Barometric Pressure (BARO) Sensor Circuit Low Voltage

DTC P2229

Barometric Pressure (BARO) Sensor Circuit High Voltage

DTC P2231

HO2S Signal Circuit Shorted to Heater Circuit Sensor 1

DTC P2232

HO2S Signal Circuit Shorted to Heater Circuit Sensor 2

DTC P2237

HO2S Pumping Current Control Circuit Sensor 1

DTC P2243

HO2S Reference Voltage Circuit Sensor 1

DTC P2251

HO2S Low Reference Circuit Sensor 1

DTC P2270

HO2S Signal Stuck Lean Bank 1 Sensor 2

DTC P2271

HO2S Signal Stuck Rich Bank 1 Sensor 2

DTC P2300, P2303, P2306, P2309, P2312, or P2315

Ignition Coil Control Circuit Low Voltage

DTC P2301, P2304, P2307, P2310, P2313, or P2316

Ignition Coil Control Circuit High Voltage

DTC P2626

HO2S Pumping Current Trim Circuit Sensor 1

DTC P2763

Torque Converter Clutch (TCC) Pressure Control (PC) Solenoid Control Circuit High Voltage

DTC P2764

Torque Converter Clutch (TCC) Pressure Control (PC) Solenoid Control Circuit Low Voltage

DTC U0001

GMLAN High Speed Serial Data Transmit Error Counter Threshold Exceeded

DTC U0100-U0299

GMLAN High Speed Serial Data Circuit

DTC U1000 and U1255

Class 2 Data Link

DTC U1001-U1254

Lost Communications With XXX

DTC U1300, U1301, or U1305

Class 2 Data Link Low or High

DTC U1500

Inter-device Dedicated Bus

DTC U2105

Lost Communications With Engine Control System