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Navistar International Fault Codes

23 Navistar International generator fault/alarm codes with symptom, cause and remedy — compiled from Navistar International service and controller documentation.

Fault / alarm codes

23
CodeMeaning / symptomCauseRemedy Models affected
116EOT above/below KOER limitsAborts KOER testNavistar International 1999 F-Series, Navistar International 7.3 DIT
117EOT circuit out of range low No cold adv. , fast low idle, EBP disabledNavistar International 1999 F-Series, Navistar International 7.3 DIT
118EOT circuit out of range high No cold adv. , fast low idle, EBP disabledNavistar International 1999 F-Series, Navistar International 7.3 DIT
1184Engine oil temp sensor out of self test rangeNavistar International 1999 F-Series, Navistar International 7.3 DIT
122AP/IVS AP Sensor Signal ORL Engine will idle only if hard faultNavistar International 1999 F-Series, Navistar International 7.3 DIT
123AP/IVS AP Sensor Signal ORH Engine will idle only if hard faultNavistar International 1999 F-Series, Navistar International 7.3 DIT
124Idle validation switch fail Switch Test -KOER Short/Open circuit, switch failure, operator, PCMNavistar International 1999 F-Series, Navistar International 7.3 DIT
152IAT circuit out of range highDisables back pressure deviceNavistar International 1999 F-Series, Navistar International 7.3 DIT
154IAT circuit out of range lowDisables back pressure deviceNavistar International 1999 F-Series, Navistar International 7.3 DIT
512KAM memory lossNo historical faults output during a KOEO testNavistar International 1999 F-Series, Navistar International 7.3 DIT
514PCM ROM test failure. Internal PCM failureNavistar International 1999 F-Series, Navistar International 7.3 DIT
523PCM_Inactive Background fault Internal PCM faultInternal PCM failureNavistar International 1999 F-Series, Navistar International 7.3 DIT
528CPP switch circuit failureNavistar International 1999 F-Series, Navistar International 7.3 DIT
536Brake On/Off switch circuit failureNavistar International 1999 F-Series, Navistar International 7.3 DIT
637Trans fluid temp sensor ckt high inputNavistar International 1999 F-Series, Navistar International 7.3 DIT
638Trans fluid temp sensor ckt low inputNavistar International 1999 F-Series, Navistar International 7.3 DIT
667TR sensor circuit low inputNavistar International 1999 F-Series, Navistar International 7.3 DIT
668TR sensor circuit high inputNavistar International 1999 F-Series, Navistar International 7.3 DIT
675TR sensor circuit malfunctionNavistar International 1999 F-Series, Navistar International 7.3 DIT
815Excessive Engine RPM Transmission incorrectly downshifted or wrong gear selected down hillTransmission incorrectly downshifted or wrong gear selected down hillNavistar International 1999 F-Series, Navistar International 7.3 DIT
827BARO circuit out of range lowDefaults to 101 KpaNavistar International 1999 F-Series, Navistar International 7.3 DIT
828BARO circuit out of range highDefaults to 101 KpaNavistar International 1999 F-Series, Navistar International 7.3 DIT
864Brake pedal applied switch failNavistar International 1999 F-Series, Navistar International 7.3 DIT

Compiled from Navistar International service manuals and controller documentation. Cause/remedy shown where extracted; always verify against the manual for your exact model.

Common questions

What does Navistar International fault code 116 mean?

EOT above/below KOER limits. Remedy: Aborts KOER test.

What does Navistar International fault code 152 mean?

IAT circuit out of range high. Remedy: Disables back pressure device.

What does Navistar International fault code 154 mean?

IAT circuit out of range low. Remedy: Disables back pressure device.

What does Navistar International fault code 512 mean?

KAM memory loss. Remedy: No historical faults output during a KOEO test.

What does Navistar International fault code 523 mean?

PCM_Inactive Background fault Internal PCM fault. Remedy: Internal PCM failure.

What does Navistar International fault code 815 mean?

Excessive Engine RPM Transmission incorrectly downshifted or wrong gear selected down hill. Remedy: Transmission incorrectly downshifted or wrong gear selected down hill.