Diagnostic Trouble Code (DTC) List/Type. Chevrolet Alero Export 1999

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 1999 🢒 Alero Export 🢒 Body and Accessories 🢒 Data Link Communications 🢒 Diagnostic Trouble Code (DTC) List/Type

Important: DO NOT replace the body control module (BCM) unless a diagnostic trouble code (DTC) remains current after all the DTC tables have been executed. DO NOT replace the BCM based on history codes.

The BCM has the following characteristics:

•	Connected to the Class 2 serial data link

•	Capable of setting DTCs

A history DTC code is a fault that disappears in the next ignition cycle. The history DTC codes are useful in diagnosing an intermittent problem. An explanation of these DTCs is given in the following table:

Diagnostic Trouble Code	Explanation
Automatic Light Control
B2575	DTC B2575 Headlamp Request/Feedback Mismatch
B2577	DTC B2577 Headlamp Control Circuit Low
B2578	DTC B2578 Headlamp Relay Output Short to Battery
B2585	DTC B2585 Parklamp Control Circuit Malfunction
B2587	DTC B2587 Parklamp Relay Output Short to Ground/Op
B2588	DTC B2588 Parklamp Relay Output Short to Battery
B2647	DTC B2647 Ambient Light Sensor Circuit Low
B2648	DTC B2648 Ambient Light Sensor Circuit High
Class 2 Serial Data
U1000	DTC U1000 Class 2 Serial Data Link Malfunction
U1016	DTC U1016 Loss of Communications with PCM
U1040	DTC U1040 Loss of Class 2 Communications with ABS
U1096	DTC U1096 Loss of Communications with IPC
U1176	DTC U1176 Loss of Communications with RFA
Controller Memory
B1001	DTC B1001 Option Configuration Error
Daytime Running Lamps
B2600	DTC B2600 Daytime Running Lamp Circuit Malfunction
B2601	DTC B2601 DRL Stuck
B2602	DTC B2602 DRL Relay Output Short to Ground/Open
B2603	DTC B2603 DRL Relay Output Short to Battery
Doors
B3127	DTC B3127 Driver Door Unlock Output Short to GND
B3128	DTC B3128 Driver Door Unlock Output Short to BATT
B3132	DTC B3132 All Door Unlock Circuit Low
B3133	DTC B3133 All Door Unlock Circuit High
B3137	DTC B3137 All Door Lock Circuit Low
B3138	DTC B3138 All Door Lock Circuit High
Foglamps
B2532	DTC B2532 Front Foglamp Relay Out Short to Ground/Open
B2533	DTC B2533 Front Foglamp Relay Output Short to Bat
Inputs
B2965	DTC B2965 Key In Ignition Fault
B1369	DTC B1369 Ignition 0 Fault
B1374	DTC B1374 Ignition 1 Fault
B1379	DTC B1379 Ignition 3 Fault
Interior Lighting Control
B2558	DTC B2558 Interior Lamp Control Output Short to Battery
Panic Horn
B2752	DTC B2752 Horn Relay Coil Circuit Low
B2753	DTC B2753 Horn Relay Coil Circuit High
Passlock® Theft Deterrent Refer to Theft Deterrent System
B2947	DTC B2947 Security System Sensor Power CKT Low
B2948	DTC B2948 Security System Sensor Power CKT High
B2957	DTC B2957 Security System Sensor Data Circuit Low
B2958	DTC B2958 Security System Sensor Data Circuit High
B2960	DTC B2960 Invalid Coded Key Present
B3031	DTC B3031 Key Decoder Device in Assem Learn Mode
B3033	DTC B3033 Security System Indicates Tamper
Rear Compartment Lid Release
B3267	DTC B3267 Decklid Output Relay Short to GND/Open
B3268	DTC B3268 Decklid Output Relay Short to BATT