Diagnostic Aids
In order to avoid a misdiagnosis, inspect for proper operation of the stop lamps.
For an intermittent condition, refer to Intermittents.
DTC P0571
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| 1 | Did you perform the Diagnostic System Check - Vehicle? | - | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 | Do the stop lamps operate properly? | - | Go to Step 3 | Go to Lighting Systems |
| 3 | Test the stop lamp switch signal circuit for an open or for a high resistance between the brake switch and the engine control module (ECM). Did you find and correct the condition? |
- | Go to Step 6 | Go to Step 4 |
| 4 | Inspect for poor connections at the harness connector of the ECM. Did you find and correct the condition? |
- | Go to Step 6 | Go to Step 5 |
| 5 | Replace the ECM. Refer to Engine Control Module Replacement Did you complete the replacement? |
- | Go to Step 6 | - |
| 6 |
|
- | Go to Step 2 | System OK |