P1682high severityPowertrain
Ignition 1 Switch Circuit 2 (Driver 5 Line 2)
on 2012 Cadillac SRX 3.6L V6 · AWD
What this code means
The PCM detected a voltage difference exceeding the maximum allowable threshold between the two circuits that supply it with battery voltage. This code is commonly caused by a failing ignition switch, which is a known issue on Trailblazer, Envoy, and SSR models among others.
Symptoms
- Check Engine Light
- Intermittent stalling
- Reduced Engine Power message
- Multiple warning lights
- Electrical accessories cutting out
- Intermittent no-start
Common causes
- Failed or failing ignition switch (most common)
- Defective fuse or fuse box
- Loose PCM power connector
- Corroded ignition switch connector
- Damaged wiring in ignition circuit
Diagnostic steps
- Test voltage at both PCM power supply circuits
- Compare voltage between the two circuits
- Inspect ignition switch connector
- Test ignition switch output under load
- Check all related fuses
Repair notes
Replace ignition switch (most common fix). Check fuses and connectors. This is a known issue on many GM trucks and SUVs, particularly Trailblazer, Envoy, and SSR.
Other Powertrain codes on this vehicle
P0001
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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