P1661high severityPowertrain
Fuel Injector Voltage Fault Cylinders 1 and 4
on 2002 Mercedes-Benz SL 3.0L I6 · RWD
What this code means
The ECU detected a voltage fault in the fuel injector circuit for Cylinders 1 and 4. These cylinders share a common injector driver circuit, and the fault affects both injectors simultaneously.
Symptoms
- Check Engine Light
- Misfires on Cylinders 1 and 4
- Rough running
- Loss of power
- Rich or lean condition
Common causes
- Faulty injector driver circuit in ECU
- Wiring short or open in shared circuit
- Failed fuel injector Cylinder 1 or 4
- Connector corrosion
- Power supply issue to injectors
Diagnostic steps
- Test injector resistance Cylinders 1 and 4
- Check shared circuit wiring
- Inspect connectors for corrosion
- Test ECU injector driver output
- Monitor injector pulse width
Repair notes
Repair wiring in the shared injector circuit or replace the faulty injector.
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