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.
Communication Error
If scan tool will not communicate with PCM (no response on scan tool) or will not respond to a particular request, a communication error exists. Scan tool may display a 2-digit code indicating a communication error (e.g., Code 10). These codes are communication status codes, not DTCs. Some status codes indicate normal communication function. See COMMUNICATION CODES table. If scan tool indicates a communication error with or without a status code, refer to SCAN TOOL COMMUNICATION ERROR TEST IDENTIFICATION table for appropriate diagnostic procedure. If scan tool displays a communication pass code (Code 62) after performing QUICK TEST, go to SYMPTOM DIAGNOSIS under SYMPTOMS in TROUBLE SHOOTING - NO CODES - VILLAGER article.
| Code | Description |
|---|---|
| 00 | General Affirmative - PCM Received A Valid Request From Scan Tool |
| 10 | General Reject - PCM Will Not Respond To Request |
| 11 | Mode Not Supported - PCM Not Capable Of Performing A Requested Test |
| 12 | Invalid Data Format - An Unrecognized Character Is Inserted Into A String Of Data |
| 21 | PCM Is Busy At Time Of Request - PCM Is Already Performing A Test At Time Another Test Is Being Requested |
| 22 | Entry Conditions Not Correct - Usually Operator Error (Engine Not Running When KOER Is Requested.) |
| 23 | Results Requested Before Completion Of Test - Request Received, But PCM Is Not Ready To Respond |
| 50 | Upload Not Accepted - Request Cannot Be Accomplished Due To A Fault Condition |
| 61 | Normal Exit With Results - PCM Completed A Valid Request (Test) & DTC Was Recorded |
| 62 | Normal Exit, No Results - PCM Completed A Valid Request & No DTC Recorded |
| 63 | Abnormal Exit With Results - While PCM Is Performing Test, Error Occurred, But PCM Has Results (DTCs) |
| 64 | Abnormal Exit Without Results - While PCM Is Performing Test, Error Occurred And No Results Are Available |
| Fault | Go To Test QA, Step | ||
|---|---|---|---|
| OBD-II Communication Error (1) | 1) | ||
| No PCM Data Through Diagnostic Connector | 10) | ||
| No TCM Data Through Diagnostic Connector | 20) | ||
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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.