Alfa Romeo OBD1 Trouble Codes
The following trouble codes are specific to Alfa Romeo.
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| Code(s) | Description |
|---|---|
| 00 | No failure type information |
| 01 | General electrical failure |
| 02 | General signal failure |
| 03 | Frequency modulated (FM)/pulse width modulated (PWM) signal failure |
| 04 | System internal failure |
| 05 | System programming failure |
| 06 | Algorithm based failure |
| 07 | Mechanical failure |
| 08 | Data bus signal/message failure |
| 09 | Component failure |
| 11 | Short circuit to earth |
| 12 | Short circuit to positive |
| 13 | Circuit open |
| 14 | Open circuit/short to earth |
| 15 | Open circuit/short to positive |
| 16 | Circuit voltage below threshold |
| 17 | Circuit voltage above threshold |
| 18 | Circuit current below threshold |
| 19 | Circuit current above threshold |
| 1A | Circuit resistance below threshold |
| 1B | Circuit resistance above threshold |
| 1C | Circuit voltage out of range |
| 1D | Circuit current out of range |
| 1E | Circuit resistance out of range |
| 1F | Circuit intermittent |
| 21 | Signal amplitude below minimum |
| 22 | Signal amplitude above maximum |
| 23 | Signal stuck low |
| 24 | Signal stuck high |
| 25 | Signal shape/waveform failure |
| 26 | Signal rate of change below threshold |
| 27 | Signal rate of change above threshold |
| 28 | Signal bias level out of range/zero adjustment failure |
| 29 | Signal invalid |
| 2A | Signal stuck in range |
| 2B | Signal cross-coupled |
| 2F | Signal erratic |
| 31 | No signal |
| 32 | Signal low time below minimum |
| 33 | Signal low time above maximum |
| 34 | Signal high time below minimum |
| 35 | Signal high time above maximum |
| 36 | Signal frequency too low |
| 37 | Signal frequency too high |
| 38 | Signal frequency incorrect |
| 39 | Signal has too few pulses |
| 3A | Signal has too many pulses |
| 41 | General checksum failure |
| 42 | General memory failure |
| 43 | Special memory failure |
| 44 | Data memory failure |
| 45 | Program memory failure |
| 46 | Calibration/parameter memory failure |
| 47 | Watchdog/safety micro-controller failure |
| 48 | Supervision software failure |
| 49 | Internal electronic failure |
| 4A | Incorrect component installed |
| 4B | Over-temperature condition |
| 51 | Component not programmed |
| 52 | Component program not activated |
| 53 | Component program disabled |
| 54 | Missing calibration |
| 55 | System not configured |
| 56 | Invalid/incompatible configuration |
| 57 | Invalid/incompatible software component |
| 61 | Signal calculation failure |
| 62 | Signal comparison failure |
| 63 | Circuit/component protection time-out |
| 64 | Signal plausibility failure |
| 65 | Signal has too few transitions/events |
| 66 | Signal has too many transitions/events |
| 67 | Signal incorrect after event |
| 68 | Event information |
| 71 | Actuator stuck |
| 72 | Actuator stuck open |
| 73 | Actuator stuck closed |
| 74 | Actuator slipping |
| 75 | Emergency position not reachable |
| 76 | Incorrect mounting position |
| 77 | Commanded position not reachable |
| 78 | Alignment or adjustment incorrect |
| 79 | Mechanical linkage failure |
| 7A | Fluid leak or seal failure |
| 7B | Low fluid level |
| 81 | Invalid serial data received |
| 82 | Alive/sequence counter incorrect/not updated |
| 83 | Value of signal protection calculation incorrect |
| 84 | Signal below allowable range |
| 85 | Signal above allowable range |
| 86 | Signal invalid |
| 87 | Missing message |
| 88 | Data bus off |
| 8F | Signal erratic |
| 91 | Component parameter out of range |
| 92 | Performance problem/malfunction |
| 93 | No operation |
| 94 | Unexpected component operation |
| 95 | Incorrect assembly |
| 96 | Component internal failure |
| 97 | Component or system operation obstructed or blocked |
| 98 | Component or system over-temperature condition |
| 9A | Component or system operating conditions |