Bendix EC-60 UDS 27 / SPN 802 FMI 12 — ECU (1B)

Code Details

Plain-English Meaning

The EC-60 detected a failure in one of its internal PMV output driver circuits (ECU (1B)). SPN 802 FMI 12 indicates the module's own switching transistor — not the external valve wiring — has failed. The output driver is the circuit inside the EC-60 that switches current to the PMV solenoid coils; when it fails, the EC-60 cannot control that valve regardless of whether the external harness and solenoid are intact. This is an internal hardware fault, not an external circuit fault.

The Bendix EC-60 table maps UDS code 27, blink code 13-12, J1587 254-12, and J1939 SPN 802 FMI 12 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 and ATC/ESP warning lamps on
• ABS disabled at the affected wheel — PMV modulation unavailable
• External PMV and harness resistance may test within specification
• Code is typically persistent once set — does not self-clear
• Multiple PMV fault codes may appear simultaneously for the same axle position

Possible Causes

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

• EC-60 output driver transistor failed from sustained over-current — typically from a prolonged external PMV wiring short
• Prior external short circuit that allowed excessive current through the driver stage
• Internal EC-60 hardware aging of the valve drive circuitry
• ESD event that damaged the driver transistor through the PMV harness connector
• Thermal overload of the driver circuit from repeated high-demand ABS activation

First Checks

• First rule out an external cause: unplug the PMV connector and measure solenoid resistance at the valve — if resistance is within spec, the external circuit is intact and the fault is internal to the EC-60.
• Check for any service history of PMV wiring shorts that may have previously stressed the driver circuit.
• Confirm there are no active external PMV short-circuit codes that indicate an ongoing harness fault loading the driver.
• If the external circuit is confirmed intact and the code persists, EC-60 replacement is indicated.
• Before removing the EC-60, transfer or document the full configuration via ACOM.

Can I Keep Driving?

An ECU internal fault typically disables all ABS, ATC, and ESP functions until the root cause is corrected and the code is cleared. Normal base braking continues. ECU codes do not resolve by themselves — clearing without diagnosis will result in the code returning. Stable power supply quality is the first thing to verify before more extensive diagnosis.

Related Lookup Pages

• FMI 12 explanation
• Bendix manufacturer hub
• ABS / ATC / ESP fault codes
• ABS Light symptom page
• Brake Warning Light symptom page
• Search this code