The P1153 code on your 2023 Chevrolet Silverado indicates that the fuel trim system on bank 1 is running richer than expected. This GM-specific code affects your Silverado's V8 engine performance and emissions, signaling that the PCM is unable to adequately lean out the air-fuel mixture on the driver's side cylinder bank.
Understanding P1153 on Silverado
Bank 1 refers to the cylinder bank containing cylinder #1, which on GM V8 engines is typically the driver's side. The fuel trim system continuously adjusts injector pulse width to maintain optimal air-fuel ratios. Code P1153 sets when the PCM detects that bank 1 O2 sensors consistently indicate rich conditions despite maximum lean fuel trim corrections.
Common Symptoms
- Check engine light on
- Decreased fuel economy
- Black smoke from exhaust
- Sulfur or rotten egg smell
- Rough idle
- Spark plug fouling on bank 1
- Possible catalytic converter damage
Primary Causes
- Leaking fuel injector on bank 1
- Faulty bank 1 oxygen sensor reading lean (causing rich compensation)
- Fuel pressure regulator stuck high
- EVAP purge valve stuck open
- Restricted air filter
- MAF sensor contamination
- PCV system malfunction
Diagnostic Procedure for 2023 Silverado
Start by comparing bank 1 and bank 2 fuel trim values. If only bank 1 shows negative fuel trims while bank 2 is normal, the problem is isolated to bank 1. Check for leaking injectors by observing fuel pressure decay with engine off. Swap bank 1 and bank 2 O2 sensors to determine if the problem follows the sensor. Inspect the EVAP system and PCV valve for proper operation. Test fuel pressure regulator vacuum response.
Repair Solutions
Replace any leaking fuel injectors identified through pressure decay testing. Install new O2 sensors if swap test indicates sensor fault. Replace stuck EVAP purge solenoid. Clean or replace contaminated MAF sensor. Ensure PCV system is functioning correctly. After repairs, clear codes and monitor fuel trim values during extended test drive to verify correction.