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
It is possible to receive a communication error from a NGS Tester when initiating a diagnostic test or accessing PIDs. The communication error can be caused by operator error, the vehicle wiring, connectors, the PCM or other control modules connected to the DLC wiring. The PCM will respond to a NGS Tester whenever the tool requests a test. These are not DTCs. Listed below are numeric codes and generic descriptions that a scan tool may display when trying to perform some PCM operations. It is possible to get other numeric codes not listed. For a complete list of communication response codes, refer to Society of Automotive Engineers (SAE) document J2190 enhanced E/E Diagnostic Test Modes. Some are normal responses to valid requests. The others are communication error responses. If the tool displays any of the communication error responses check scan tool connections, cable/adapters and entry of vehicle information.
| Numeric Code | Generic Description | Expanded Description |
|---|---|---|
| NORMAL PCM RESPONSES | ||
| 00 | General affirmative | PCM received a valid request from scan tool. |
| 62 | Normal exit without test results | PCM performed a valid request from scan tool and has no results (i. e., KOEO Self-Test performed with no DTCs recorded). |
| 61 | Normal exit with test results | PCM performed a valid request from scan tool and has results (i. e., KOEO Self-Test was performed and a DTC was recorded). |
| ABNORMAL PCM RESPONSES | ||
| 10 | General reject | PCM will not respond to request. |
| 11 | Mode not supported | PCM is not capable of performing a requested test (i. e., turn injectors on and off). |
| 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 the time another test is requested. |
| 22 | Entry conditions not correct | Usually operator error (i. e., engine not running or in gear when requesting KOER Self-Test). |
| 23 | Asked for results before done | A message was received by the PCM but the PCM is not ready to respond. |
| 50 | Upload not accepted | A request for information or a test cannot be accomplished due to a fault condition. |
| 63 | Abnormal exit with results | While PCM is performing a test, an error occurred, but PCM has results (i. e., DTCs). |
| 64 | Abnormal exit without results | While PCM is performing a test, an error occurred and no results are available (i. e., aborted KOER Self-Test before DTC was recorded). |
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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.
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