Jeep OBD1 Codes List (Free Download PDF)
Do you own a Jeep from the early 90s and experiencing the problems with OBD1 codes? Are you feeling overwhelmed and unsure of where to start troubleshooting?
Don’t worry. We are here to assist you.
Our comprehensive Jeep OBD1 code list includes a list of codes and their meanings, which helps you diagnose your car’s problems quickly and easily. With this list, you can keep your Jeep running smoothly and efficiently, no matter its age.
So, don’t wait any longer. Let’s start exploring this code list now!
A Complete List Of Jeep OBD1 Codes + Free Download
Free Download: A Complete Jeep OBD1 Trouble Codes List PDF
Note: To read the Jeep OBD1 codes list table on your mobile device, swipe left or right to scroll through the codes and their descriptions.
| Code | Meaning |
|---|---|
| Code 11 | No ignition reference signal detected during cranking OR timing belt skipped one or more teeth; OR loss of either camshaft or crankshaft position sensor. |
| Code 12 | Battery or computer recently disconnected |
| Code 13 | MAP sensor or vacuum line may not be working |
| Code 13 | No change in MAP from “Start” to “Run” |
| Code 14 | MAP sensor voltage below .16V or over 4.96V |
| Code 15 | No speed/distance sensor signal |
| Code 16 | Loss of battery voltage detected with engine running |
| Code 17 | Engine stays cool too long |
| Code 17 | Knock sensor circuit |
| Code 21 | Oxygen sensor signal doesn’t change (stays at 4.3-4.5V). Probably bad oxygen sensor. |
| Code 21 | Oxygen sensor signal shorted to voltage. Probably bad oxygen sensor. |
| Code 22 | Coolant sensor signal out of range – May have been disconnected to set timing |
| Code 23 | Incoming air temperature sensor may be bad |
| Code 24 | Throttle position sensor over 4.96V |
| Code 25 | Automatic Idle Speed (AIS) motor driver circuit shorted or target idle not reached |
| Code 26 | Peak injector circuit voltage has not been reached (need to check computer signals, voltage reg, injectors) |
| Code 27 | Injector circuit isn’t switching when it’s told to (TBI) |
| Code 27 | Injector circuit #1 not switching right |
| Code 27 | Injector circuit #2 not switching right |
| Code 27 | Injector output driver not responding – check computer, connections |
| Code 31 | Bad evaporator purge solenoid circuit or driver |
| Code 32 | Power loss/limited lamp or circuit |
| Code 32 | EGR gases not working (1988) – check vacuum, valve |
| Code 32 | Computer didn’t see change in air/’fuel ratio when EGR activated – check valve, vacuum lines, and EGR electrical |
| Code 33 | Air conditioning clutch relay circuit open or shorted (may be in the wide-open-throttle cutoff circuit or normal on early 80’s models if you don’t have air conditioning) |
| Code 34 | EGR solenoid circuit shorted or open |
| Code 34 | Speed control shorted or open |
| Code 35 | Cooling fan relay circuit open or shorted |
| Code 35 | Idle switch motor fault – check connections |
| Code 36 | Wastegate control circuit open or shorted |
| Code 37 | Shift indicator light failure, 5-speed |
| Code 37 | Part throttle lock/unlock solenoid driver circuit |
| Code 37 | Solenoid coil circuit |
| Code 37 | Trans temperature sensor voltage low |
| Code 41 | Alternator field control circuit open or shorted |
| Code 42 | Automatic shutdown relay circuit open or shorted |
| Code 42 | Fuel pump relay control circuit |
| Code 42 | Fuel level unit – no change over miles |
| Code 42 | Z1 voltage missing when autoshutdown circuit energized (The Z1 voltage is the voltage of the circuits fed by the autoshutdown relay. This typically includes fuel pump and switched-battery feed to the ignition coil) |
| Code 43 | Peak primary coil current not achieved with max dwell time |
| Code 43 | Cylinder misfire |
| Code 43 | Problem in power module to logic module interface |
| Code 44 | No FJ2 voltage present at logic board |
| Code 44 | Logic module self-diagnostics indicate problem |
| Code 44 | Battery temperature out of range |
| Code 45 | Turbo boost limit exceeded (engine was shut down by logic module) |
| Code 46 | Battery voltage too high during charging or charging system voltage too low |
| Code 47 | Battery voltage too low and alternator output too low |
| Code 51 | Oxygen sensor stuck at lean position |
| Code 51 | Internal logic module fault |
| Code 52 | Oxygen sensor stuck at rich position |
| Code 52 | Internal logic module fault |
| Code 53 | Logic module internal problem |
| Code 54 | No sync pickup signal during engine rotation |
| Code 54 | Internal logic module fault (’84 turbo only) – or camshaft sensor/distributor timing |
| Code 55 | End of codes |
| Code 61 | “Baro” sensor open or shorted |
| Code 62 | EMR mileage cannot be stored in EEPROM |
| Code 62 | PCM failure SRI mile not stored |
| Code 63 | Controller cannot write to EEPROM |
| Code 64 | Catalytic converter efficiency failure |
| Code 65 | Power steering switch failure |
| Code 66 | No CCD Message From TCM and/or No CCD Message From BCM |
| Code 76 | Fuel pump ballast bypass relay circuit |
Final Thoughts
Maintaining your Jeep has never been easier, thanks to our OBD1 codes list. With this list, you can take control of your vehicle’s problems and avoid costly further repairs.
If you successfully diagnosed your Jeep’s issues using our OBD1 codes list, share your experiences in the comments below and help fellow Jeep owners troubleshoot.
And if you encounter any trouble decoding Jeep OBD2 codes, our comprehensive Jeep OBD2 codes list is available to help. READ NOW!
Tools Recommendation
Whether you’re a DIY mechanic or a professional, having the proper tools to diagnose and troubleshoot electrical issues in your Jeep is crucial. Our comprehensive Jeep OBD1 codes list is an essential tool for any automotive project, and we recommend a high-quality OBD1 scanner to read and interpret Jeep-specific codes. With the help of our Jeep OBD1 codes list, you can diagnose and fix electrical issues with ease and confidence, keeping your vehicle running smoothly.
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References Sources
We take accuracy seriously at OBDCodex, which is why we rely on trusted reference sources for all of our OBD1 code lists. This is the source we consulted to compile our comprehensive Jeep OBD1 codes list:
- Jeep Computer codes – cherokeeforum.com
- 1991-1995 Jeep Cherokee XJ OBD-I Diagnostic Trouble Codes
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