Truck Fault Codes

Bendix Fault Code Context

Bendix ABS, ATC, and stability-control faults should be treated as safety-related and verified with the appropriate Bendix diagnostic information. This hub does not claim to replace official OEM service information or diagnostic software.

Review status: source-backed medium Last reviewed: 2026-04-03

Bendix ABS and Stability Control Architecture

Bendix Commercial Vehicle Systems produces ABS, ATC (automatic traction control), ESP (electronic stability program), and related safety systems for heavy-duty trucks and trailers. The EC-60 controller (Standard and Advanced versions) is one of the most widely deployed ABS controllers in the North American Class 8 market. The EC-80 is Bendix's current-generation controller supporting full stability and roll control functions.

Bendix systems monitor individual wheel speeds through wheel speed sensors at each axle, control modulator valves that apply or release brake pressure independently, and manage traction and stability interventions. All brake-related fault codes are safety-relevant — wheel speed sensor faults, modulator valve faults, and system power faults affect the ABS coverage that the system provides.

Bendix ACOM Pro Diagnostic Software

ACOM Pro is Bendix's OEM diagnostic software for ABS and stability control systems. It provides full fault code history, individual wheel speed monitoring, modulator valve actuation tests, system configuration parameters, and end-of-line calibration functions. Generic J1939 scanners can read Bendix fault codes broadcast over the J1939 network, but cannot perform component tests or access the full diagnostic parameter set.

For any fault that involves ABS system configuration, wheel speed sensor calibration, end-of-line validation, or modulator valve testing, ACOM Pro is the appropriate tool. Its blink code feature can guide a technician through basic diagnostics without a laptop, though ACOM Pro provides significantly more detail.

EC-60 vs. EC-80 Controller Differences

The Bendix EC-60 (Standard and Advanced) and EC-80 are different controller generations with different fault code tables and capability sets. The EC-60 Standard provides basic ABS with modulator control; the EC-60 Advanced adds RSC (roll stability control) and ATC functions. The EC-80 supports the full range of stability interventions including ESP and has expanded communication capabilities.

Fault codes that appear the same (identical SPN/FMI) may have different diagnostic procedures, thresholds, and severity levels between the EC-60 and EC-80. Bendix documentation identifies which controller is installed, and ACOM Pro queries the controller type before displaying fault history. Using documentation for the wrong controller generation can lead to incorrect diagnostic conclusions.

ABS Fault Code Safety Considerations

All Bendix ABS and stability control fault codes are safety-adjacent — they affect the function of a system that plays a direct role in braking performance and vehicle stability. FMCSA regulations require that ABS systems be functional on commercial vehicles, and a truck with an active ABS fault lamp may have reduced or absent ABS coverage on one or more axles.

Pages on this site that cover Bendix fault codes use Bendix's published ABS maintenance documentation and relevant FMCSA and NHTSA technical sources as their source basis. These pages describe diagnostic context and first checks; they do not provide shop-level repair procedures or override Bendix's official service documentation and ACOM Pro diagnostic guidance.

Fault Code Coverage on This Site

Bendix coverage is the most extensive of any manufacturer section on this site, organized around the EC-60 Standard and EC-60 Advanced controllers. Wheel Speed Sensor (WSS) fault categories are covered for all six axle positions (steer axle left/right, drive axle left/right, front/tag axle left/right), each with six fault type variants: open circuit or short to ground, sensor configuration error, wheel end fault, excessive air gap, drive-off output low, erratic signal, and loss of signal. Pressure Modulator Valve (PMV) categories cover hold solenoid, release solenoid, common supply, configuration, and trailer PMV faults.

ECU internal fault coverage is differentiated by SPN/FMI subgroup: SPN 629 FMI 12 (processor or hardware fault), SPN 629 FMI 2 (data erratic or intermittent, power-related), SPN 630 FMI 12 (RAM fault), SPN 630 FMI 13 (EEPROM or calibration data fault), and SPN 802 FMI 12 (PMV output driver circuit fault). J1939 communication fault coverage spans engine ECM, transmission controller, retarder controller, XBR source, supply pressure source, and auxiliary I/O sources. Power supply categories include over-voltage, under-voltage, during-ABS voltage drop, open circuit, and electrical noise. Specialty fault categories include YRS (yaw rate sensor), SAS (steering angle sensor), TCV, HSA, load sensor, and retarder relay faults. All Bendix pages reference Bendix ACOM Pro and the Bendix EC-60 service data publication as their source basis.

Related Pages

Related Fault Code Pages

Official Resources

Sources

  • Bendix ACom PRO Diagnostic Software Bendix Commercial Vehicle Systems · oem · accessed 2026-05-05 · confidence medium

    Source: Bendix Commercial Vehicle Systems, Bendix ACom PRO Diagnostic Software. This page paraphrases factual fields only and is not a substitute for the original document.

    Open source
  • 49 CFR Part 393 - Parts and Accessories Necessary for Safe Operation Electronic Code of Federal Regulations · government · accessed 2026-05-05 · confidence high

    Source: Electronic Code of Federal Regulations, 49 CFR Part 393 - Parts and Accessories Necessary for Safe Operation. This page paraphrases factual fields only and is not a substitute for the original document.

    Open source

FAQ

Does every Bendix ABS warning code indicate an immediate safety emergency?

Not all Bendix codes require an immediate stop, but all brake and ABS codes should be treated as safety-related and investigated promptly. A wheel speed sensor fault may not affect braking immediately, but it disables part of the ABS coverage. A modulator valve or power fault could be more significant. FMCSA regulations and Bendix's own guidance treat ABS concerns as requiring attention before operating conditions worsen.

Is ACOM Pro required for Bendix ABS diagnosis, or will a standard J1939 scanner work?

A standard J1939 scanner can read Bendix SPN/FMI codes. ACOM Pro (Bendix's own diagnostic software) provides component-level tests, end-of-line calibration, modulator valve activation, and system configuration options that generic tools cannot perform. For anything beyond reading stored codes — such as wheel speed sensor testing, modulator testing, or system configuration — ACOM Pro is the appropriate tool.

Does Bendix code meaning differ between the EC-60 and EC-80 ABS controllers?

The EC-60 and EC-80 are different controller generations with different capabilities (EC-80 supports stability and roll control functions). While both use J1939 and some of the same SPN/FMI conventions, the specific code tables, configuration parameters, and diagnostic procedures differ. Bendix's documentation for the specific controller generation (and whether it is the Standard or Advanced version) is needed for accurate interpretation.

Which Bendix ABS controllers and fault code categories are covered on this site?

This site provides the most extensive Bendix coverage of any section, focused on the Bendix EC-60 Standard and EC-60 Advanced controllers — the most widely deployed ABS controllers in the North American Class 8 fleet. Coverage is organized by fault subgroup: Wheel Speed Sensor (WSS) faults covering all six axle positions (steer axle left/right, drive axle left/right, front axle left/right) across six fault types per position (open/short, configuration error, wheel end, excessive air gap, drive-off output low, erratic signal, loss of signal); Pressure Modulator Valve (PMV) faults covering hold solenoid, release solenoid, common supply, configuration error, and trailer PMV categories; ECU internal faults differentiated by SPN/FMI subgroup (SPN 629 FMI 12 processor fault, SPN 629 FMI 2 erratic/intermittent, SPN 630 FMI 12 RAM fault, SPN 630 FMI 13 EEPROM fault, SPN 802 FMI 12 output driver fault); J1939 communication faults for engine ECM, transmission, retarder, XBR, supply pressure, and auxiliary I/O sources; power supply faults for over-voltage, under-voltage, during-ABS voltage, open circuit, and electrical noise conditions; and sensor and specialty fault categories including YRS, SAS, LAS, TCV, HSA, load sensor, and retarder relay. All Bendix pages reference Bendix ACOM Pro as the diagnostic tool.