Bendix EC-60 UDS 229 / SPN 799 FMI 5 — AA Left PMV REL Solenoid Open Circuit

Code Details

Plain-English Meaning

The EC-60 detected a open circuit in the release (REL) solenoid of the front axle left PMV. The release solenoid vents brake pressure during ABS modulation; a fault here disables that part of the modulation cycle at that wheel.

The Bendix EC-60 table maps UDS code 229, blink code 16-03, J1587 052-05, and J1939 SPN 799 FMI 5 to this ABS/ATC/ESP diagnostic entry. The Bendix source indicates an ABS and/or ATC/ESP warning lamp can be on for this entry. The EC-60 continuously monitors wheel speed sensor circuits, pressure modulation valve output drivers, supply voltage quality, J1939 network data from the engine and transmission controllers, and internal self-diagnostic routines. When any monitored value falls outside its acceptable range — or a circuit does not respond as the module expects — the EC-60 logs a diagnostic trouble code and may disable the affected ABS, ATC, or ESP function. Bendix ACOM Pro or a compatible diagnostic interface is the required tool for reading live sensor data, running actuator tests, performing calibrations, clearing latched codes, and adjusting EC-60 configuration parameters. Generic J1939 scan tools can read the SPN/FMI but cannot access EC-60-specific live data screens or configuration settings.

Common Symptoms

• ABS warning lamp on
• ATC/ESP lamp on if stability functions are affected
• ABS disabled at the affected wheel — valve cannot modulate
• Scan tool shows Bendix EC-60 UDS 229 / SPN 799 FMI 5 active or stored
• No unusual brake feel under normal braking; the fault matters only during ABS activation

Possible Causes

Possible causes may include the items below. The list is not a parts diagnosis.

• Break in the release (REL) solenoid wiring between EC-60 and front axle left PMV connector
• Corroded or backed-out terminal in the front axle left PMV connector at the release (REL) solenoid pin
• front axle left PMV release (REL) coil internally open (confirm by measuring resistance at the valve connector)
• Harness damage on the front axle left PMV branch where it flexes near the axle housing, air spring, or suspension bracket
• Moisture inside the front axle left PMV connector creating a leakage path between solenoid terminals

First Checks

• Unplug the front axle left PMV connector and measure the release (REL) solenoid resistance — compare to Bendix specification (typically 3–15 Ω depending on valve type).
• Measure continuity from the front axle left PMV release (REL) pin back to the EC-60 harness connector — no continuity confirms a broken wire.
• Inspect the front axle left PMV connector for corrosion, bent pins, and missing terminal locks.
• Trace the front axle left PMV harness branch along the axle and frame rail for abrasion, especially where it crosses suspension components.
• After repair, clear Bendix EC-60 UDS 229 / SPN 799 FMI 5 with Bendix ACOM, perform a functional brake test, and confirm no related front axle left PMV codes remain.

Can I Keep Driving?

A pressure modulation valve fault means the EC-60 may not be able to independently modulate brake pressure at the affected wheel during ABS activation. Normal brake application still functions, but anti-lock control at that corner is compromised. If the PMV cannot release pressure during a lockup event, wheel lockup may occur despite the ABS system being otherwise functional. Address before operating in conditions requiring aggressive braking.

Related Lookup Pages

• FMI 5 explanation
• Bendix manufacturer hub
• ABS / ATC / ESP fault codes
• ABS Light symptom page
• Brake Warning Light symptom page
• Search this code