Freightliner ABS code 136 is the SAE J1587 Message Identifier (MID) for the Anti-lock Brake System controller. It identifies the ABS ECU as the source of a stored fault. The complete fault code consists of 3 parts: MID 136, a Subsystem Identifier (SID), and a Failure Mode Indicator (FMI).
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Federal brake-system rules are published in FMCSA brake systems guidance.
What Is Freightliner ABS Code 136?
Freightliner ABS code 136 is MID 136, the standard SAE J1587 identifier assigned to the Anti-lock Brake System electronic control unit. When a fault is logged, the diagnostic system records MID 136 alongside a SID and FMI to identify the specific component and failure type.
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MID 136 appears in Freightliner trucks equipped with ABS systems from manufacturers that include Meritor WABCO and Bendix Commercial Vehicle Systems.
Which Freightliner Models Display ABS Code 136?
Freightliner models that display MID 136 ABS faults include:
- Cascadia (2008 to present)
- Classic XL
- Columbia
- Coronado
- Business Class M2
All models use the SAE J1587 or J1939 data link protocol for fault reporting. MID 136 is consistent across these platforms.
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How Do You Read a Complete Freightliner ABS Code 136 Fault?
A complete Freightliner ABS code 136 fault is read as a 3-part code: MID 136 / SID / FMI. MID 136 identifies the ABS ECU. The SID identifies the specific subsystem or component. The FMI identifies the type of electrical or mechanical failure.
Example: MID 136 / SID 1 / FMI 8 means the ABS ECU (136) detected an abnormal signal frequency (FMI 8) from the steer axle left wheel speed sensor (SID 1).
What Are the SID Codes Under Freightliner MID 136?
| SID | Component | Position |
|---|---|---|
| 1 | Wheel speed sensor | Steer axle, left |
| 2 | Wheel speed sensor | Steer axle, right |
| 3 | Wheel speed sensor | Drive axle, left |
| 4 | Wheel speed sensor | Drive axle, right |
| 5 | Wheel speed sensor | Tag or pusher axle, left |
| 6 | Wheel speed sensor | Tag or pusher axle, right |
| 7 | Modulator valve | Position 1 |
| 8 | Modulator valve | Position 2 |
| 9 | Modulator valve | Position 3 |
| 10 | Modulator valve | Position 4 |
| 16 | ABS warning lamp | Dash indicator circuit |
| 231 | J1587 data link | Communication circuit |
| 240 | ECU power supply | Controller voltage input |
What Are the FMI Codes Used With Freightliner MID 136?
| FMI | Failure Description |
|---|---|
| 2 | Signal erratic, intermittent, or incorrect |
| 3 | Voltage above normal or shorted high |
| 4 | Voltage below normal or shorted low |
| 5 | Current below normal or open circuit |
| 6 | Current above normal or grounded circuit |
| 8 | Abnormal signal frequency or pulse width |
| 11 | Root cause not known |
| 12 | Faulty component or intelligent device |
| 14 | Special instructions required |
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What Are the Most Common Freightliner ABS Code 136 Faults?
| Fault Code | System Area | Most Likely Cause |
|---|---|---|
| MID 136 / SID 1 / FMI 2 | Steer axle left sensor | Erratic sensor signal |
| MID 136 / SID 1 / FMI 8 | Steer axle left sensor | Tone ring damage or gap fault |
| MID 136 / SID 2 / FMI 2 | Steer axle right sensor | Erratic sensor signal |
| MID 136 / SID 3 / FMI 8 | Drive axle left sensor | Tone ring or wiring fault |
| MID 136 / SID 7 / FMI 5 | Modulator valve 1 | Open circuit in solenoid |
| MID 136 / SID 7 / FMI 6 | Modulator valve 1 | Short circuit in solenoid |
| MID 136 / SID 16 / FMI 4 | ABS warning lamp | Lamp circuit voltage low |
| MID 136 / SID 240 / FMI 4 | ECU power supply | Low supply voltage |
| MID 136 / SID 231 / FMI 9 | J1587 data link | Communication update fault |
SID 1 and SID 2 faults are the most frequent. Wheel speed sensor faults account for the majority of MID 136 activations on Freightliner trucks.
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How Do You Diagnose Freightliner ABS Code 136 Faults?
Diagnosing Freightliner ABS code 136 faults requires 4 steps:
- Retrieve the full MID/SID/FMI code using a compatible diagnostic tool.
- Identify the component from the SID number using the table above.
- Inspect the wiring, connector, and sensor at that component location.
- Test circuit resistance and voltage with a multimeter to confirm the fault.
What Tools Are Required to Diagnose Freightliner ABS Code 136?
| Tool | Purpose | Estimated Cost |
|---|---|---|
| Freightliner ServiceLink or Detroit Diesel Diagnostic Link (DDDL) | Full MID/SID/FMI retrieval | $300 to $1,500 |
| Autel MaxiCOM MK908P or similar | J1587/J1939 ABS fault access | $900 to $1,500 |
| Multimeter | Resistance and voltage testing | $20 to $80 |
| Feeler gauge | Wheel speed sensor air gap measurement | $5 to $15 |
Note: Standard OBD-II scanners do not access J1587 MID 136 faults. Use a heavy-duty truck diagnostic tool.
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How Do You Repair Common Freightliner ABS Code 136 Faults?
How Do You Repair a Wheel Speed Sensor Fault (SID 1 to 6)?
Wheel speed sensor faults under MID 136 SID 1 to 6 are repaired through 4 steps:
- Locate the sensor at the flagged axle position.
- Inspect the sensor cable for cuts, abrasion, or connector corrosion.
- Measure the air gap between the sensor tip and tone ring. The standard gap for Meritor WABCO sensors is 0.040 to 0.120 inches (1.0 to 3.0 mm).
- Replace the sensor if resistance is outside the 900 to 2,000 ohm range measured across the sensor terminals.
Inspect the tone ring for missing, cracked, or packed teeth. A damaged tone ring produces FMI 8 (abnormal frequency) regardless of sensor condition.
How Do You Repair a Modulator Valve Fault (SID 7 to 10)?
Modulator valve faults under MID 136 SID 7 to 10 are caused by open or short circuits in the solenoid coil. Repair follows 3 steps:
- Disconnect the valve connector and test solenoid resistance. Standard resistance is 3.5 to 8 ohms per coil.
- Test for a short to ground with the connector disconnected. Resistance to ground at the solenoid terminals indicates an internal short.
- Replace the modulator valve assembly if the solenoid tests outside the specified resistance range.
How Do You Repair an ECU Power Supply Fault (SID 240)?
SID 240 / FMI 4 indicates ECU supply voltage is below 9V. SID 240 / FMI 3 indicates voltage exceeds 16V. Repair involves:
- Testing battery voltage at idle and under load
- Inspecting ECU power and ground connections for corrosion or looseness
- Testing alternator output voltage (standard: 13.5V to 14.5V at operating speed)
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How Do You Clear Freightliner ABS Code 136 Faults?
Freightliner ABS code 136 faults clear through 2 methods:
- Use Freightliner ServiceLink or a compatible J1587/J1939 diagnostic tool to select the ABS ECU and clear stored faults after repair.
- The ECU clears intermittent faults automatically after the vehicle completes 3 drive cycles above 6 mph with no fault redetected.
Faults stored as active do not clear automatically. Repair the component first, then clear with a diagnostic tool.
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What Is the Most Reliable Method for Resolving Freightliner ABS Code 136?
The most reliable resolution for Freightliner ABS code 136 starts with retrieving the full MID 136 / SID / FMI code. The SID identifies the exact component. The FMI identifies the exact failure type. Repairing without the full code risks replacing components that are not at fault.
Freightliner ServiceLink provides the most complete diagnostic access to MID 136 faults. It retrieves active and inactive fault history, live sensor data, and valve function tests. Use it to confirm the root cause before replacing any component.
Jimmy O’Riley is a UK-based mobile mechanic and automotive diagnostic specialist operating out of Bedfordshire, England. He founded O’Rileys Autos in 2011 with a focus on bringing professional vehicle repairs directly to customers at their homes and workplaces.
With over a decade of hands-on experience, Jimmy specializes in ABS diagnostics, brake system repairs, diesel emissions faults, and DPF cleaning. He is recognized across the UK and Ireland as one of the leading specialists in vehicle braking and emissions systems, earning the title “The DPF King” from his growing online audience.
Jimmy documents real-world automotive repairs through his YouTube channel, which has accumulated over 97,000 subscribers and nearly 2,000 published repair videos. His content covers ABS fault diagnosis, wheel speed sensor testing, brake module replacement, and roadside repair procedures across a wide range of vehicle makes and models.
He is active on YouTube, Instagram, and Facebook under O’Rileys Autos.