Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Circuit/System Verification
- Ignition/Vehicle & All vehicle systems - Off
- Test for 12.4 to 12.8 V between the test points:Battery Positive Post & Battery Negative Post
- If not between 12.4 and 12.8 V
Refer to:Battery Inspection/Test
- Go to next step: If between 12.4 and 12.8 V
- If not between 12.4 and 12.8 V
- Inspect the electrical connectors and the ground circuits of the component for poor connections. - K20 Engine Control Module & T19 Power Supply Transformer
- If a condition exists
Repair as necessary - Wiring/Terminal(s) /Electrical Connector(s)
- Go to next step: If no condition exists
- If a condition exists
- Verify no communication DTCs are set.
- If a communication DTC is set
- Go to next step: If a communication DTC is not set
- Engine - Running - For greater than 15 s
- Headlamp - ON
- Test for 13.4 to 15 V between the test points:Battery Positive Post & Battery Negative Post
- If not between 13.4 and 15 V
Refer to:Charging System Test
- Go to next step: If between 13.4 and 15 V
- If not between 13.4 and 15 V
- Verify the component activates: - Ignition On..
- A11 Radio
- P16 Instrument Cluster
- If the component does not activate
Refer to: Circuit/System Testing
- Go to next step: If the component activates
- Verify DTC P3051, P3053, P3055 is not set.
- If any of the DTCs are set
Refer to: Circuit/System Testing
- Go to next step: If the DTC does not set
- If any of the DTCs are set
- All OK.
The battery voltage should stabilize after a few minutes of turning the ignition/vehicle Off.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.