P1600moderate severityPowertrain
PCM Battery Direct Power Circuit
on 2005 Cadillac CTS 2.8L V6 · RWD
What this code means
The PCM detected an issue with its direct battery power supply circuit. This circuit maintains PCM memory and learned values when the ignition is off.
Symptoms
- Check Engine Light
- Lost adaptive memory
- Poor idle after battery service
- Transmission relearn needed
- Multiple codes may set simultaneously
Common causes
- Low battery voltage
- Corroded battery cables
- Loose PCM power connection
- Blown PCM power fuse
- Damaged PCM power wiring
Diagnostic steps
- Test battery voltage
- Inspect battery cable connections
- Check PCM power fuse
- Test voltage at PCM battery circuit
- Inspect PCM connector for corrosion
Repair notes
Check battery and cable connections. Verify PCM power fuse. Clean and secure all connections.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1