SES Or Oil Level Lamp Illuminates, Spark Knock, Exhaust Popping (Replace PCM)
| Subject: | Various Driveability Concerns -- SES or Oil Level Lamp Illuminates, Spark Knock, Exhaust Popping (Reprogram PCM) |
| Models: | 1999 Chevrolet and GMC C/K Models (Silverado and Sierra) |
| with 4.8 L, 5.3 L or 6.0 L V8 Engine (VINs V, T, U -- RPOs LR4, LM7, LQ4) |
| Built prior to the following VIN breakpoints: |
Assembly Plant | Division | VIN Breakpoints |
|---|---|---|
Ft. Wayne | Chevrolet | 1GCEK19T5XZ191097 |
Ft. Wayne | GMC | 1GTEC14V0XZ532508 |
Oshawa | Chevrolet | 2GCEK19T9X1253206 |
Oshawa | GMC | 2GTEC19T5X1554147 |
Pontiac East | Chevrolet | 1GCEK19T8XE221684 |
Pontiac East | GMC | 1GTEK19T0XE546121 |
Condition
Some customers may comment on one or more of the following conditions.
| Condition | Engine RPO | Transmission |
|---|---|---|---|
1 | Service Engine Soon Lamp Illuminated with a stored DTC P0704 (Clutch Switch Circuit) | LR4 LQ4 | Manual |
2 | Service Engine Soon Lamp Illuminated with a stored DTC P0121 (TP System Performance) | LR4 LM7 LQ4 | All |
3 | Oil Level Lamp Illuminated with engine oil level OK as measured on the dipstick | LR4 LQ4 | All |
4 | Audible spark knock (detonation) and light hesitation | LM7 | M30 |
5 | Short burst detonation and spark knock at idle at high ambient temperatures | LQ4 | MT1 |
6 | Lean sag after hot restart, coolant above 85°C (185°F) | LQ4 | All |
7 | Exhaust Popping on deceleration | LQ4 | All |
Cause
Calibrations were not optimized for various operating parameters.
Correction
New calibrations have been released to address the conditions listed above.
Perform the existing diagnostic procedures to verify that the DTCs and driveability concerns are not the result of an inoperative component, or a related wiring or other condition, then reprogram the PCM with the correct calibration listed below.
Parts Information
Calibrations
Old Cal P/N | New Cal P/N | Vehicle | Engine RPO | Transmission RPO | Fuel/Emissions |
|---|---|---|---|---|---|
16263835 | 9357587 | 2 and 4WD 1/2 ton | LR4 4.8 L | Automatic M30 | NF2-NN8 (Federal Tier 1, Canada) |
16263836 | 9357588 | 2 and 4WD 1/2 ton | LR4 4.8 L | Automatic M30 | NN8 (Non-European Unleaded Fuel Export) |
16263837 | 9357589 | 2 and 4WD 1/2 ton | LR4 4.8 L | Automatic M30 | NC1 (California LEV) |
16263739 | 9357590 | 2 and 4WD 1/2 ton | LR4 4.8 L | Manual MG5 | NB6/NF2-NN8 (Nationwide and Canada) |
16263740 | 9357591 | 2 and 4WD 1/2 ton | LR4 4.8 L | Manual MG5 | NN8 (Non-European Unleaded Fuel Export) |
16263741 | 9357592 | 2 and 4WD 1/2 ton | LR4 4.8 L | Manual MG5 | NM2 (Leaded Fuel Export) |
16263712 | 9357593 | 2 and 4WD 1/2 ton, 2WD 3/4 ton | LM7 5.3 L | Automatic M30 | NF2-NN8 (Federal Tier 1 and Canada) |
16263713 | 9357594 | 2 and 4WD 1/2 ton, 2WD 3/4 ton | LM7 5.3 L | Automatic M30 | NN8 (Non-European Unleaded Fuel Export) |
16263715 | 9357595 | 2 and 4WD 1/2 ton, 2WD 3/4 ton | LM7 5.3 L | Automatic M30 | NC1 (California LEV) |
16263727 | 9357596 | 2 and 4WD 1/2 ton | LM7 5.3 L | Automatic M30 | NM2 (Leaded Fuel Export) |
16263771 | 9357597 | 2WD 3/4 ton | LQ4 6.0 L | Automatic MT1 | NA7 (European Unleaded Fuel Export) |
16263772 | 9357598 | 2 and 4WD 3/4 ton | LQ4 6.0 L | Automatic MT1 | NA4 and NF2-NN8#, NB6 and ZW9 (Federal Tier 1 over 8500 lbs GVW, California Tier 1 Incomplete Vehicle, Canada) |
16263773 | 9357599 | 2 and 4WD 3/4 ton | LQ4 6.0 L | Automatic MT1 | NN8 (Non-European Unleaded Fuel Export) |
16263774 | 9357600 | 2 and 4WD 3/4 ton | LQ4 6.0 L | Automatic MT1 | NA1 and NF2-NN8#, NB6 and E63 (Federal Tier 1 Under 8500 lbs GVW, California Tier 1 Complete Vehicle, Canada) |
16263775 | 9357601 | 2 and 4WD 3/4 ton | LQ4 6.0 L | Automatic MT1 | NM2 (Leaded Fuel Export) |
16263776 | 9357602 | 2 and 4WD 3/4 ton | LQ4 6.0 L | Manual MW3 | NB6 and ZW9#, NF2-NN8 (Federal Tier 1 Over 8500 lbs GVW, California Tier 1 Incomplete Vehicle, Canada) |
16263777 | 9357603 | 2 and 4WD 3/4 ton | LQ4 6.0 L | Manual MW3 | NN8 (Non-European Unleaded Fuel Export) |
16263778 | 9357604 | 2 and 4WD 3/4 ton | LQ4 6.0 L | Manual MW3 | NB6 and E63 (California Tier 1 Complete vehicle, Canada) |
16263779 | 9357605 | 2 and 4WD 3/4 ton | LQ4 6.0 L | Manual MW3 | NM2 (Leaded Fuel Export) |
The calibrations listed are electronic calibrations and are NOT available from GMSPO. Calibrations are available from Techline starting June, 1999 on the TIS 2000 Disc 12 CD ROM.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation | Description | Labor Time |
|---|---|---|
J6355 | PROM, Reprogramming On Vehicle | Use Published Labor Time |
