Bendix EC-60 UDS 78 / SPN 1808 FMI 14 — Erratic ESP Sensor Signal

Code Details

Plain-English Meaning

The EC-60 detected an erratic signal from an ESP sensor. The output is fluctuating in a pattern that does not correspond to actual vehicle dynamics, affecting one or more of the stability sensors used in ESP control.

The Bendix EC-60 table maps UDS code 78, blink code 23-07, J1587 099-14, and J1939 SPN 1808 FMI 14 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

• ESP lamp on
• ESP may activate or suppress incorrectly during normal cornering
• Live data shows unstable, jumping readings from the affected sensor
• ABS and ATC continue normally
• May correlate with road surfaces, temperature, or vibration conditions

Possible Causes

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

• Intermittent connector or harness fault on the affected sensor
• Sensor internal fault producing noise on the output
• Electrical interference from nearby components or aftermarket accessories
• Sensor mounting loose, vibrating independently of the chassis
• Moisture in the sensor connector creating a leakage path

First Checks

• Use Bendix ACOM live data to identify which specific sensor is erratic.
• Inspect that sensor's connector and mounting for looseness, corrosion, or damage.
• Flex the sensor harness while watching live data — an intermittent open shows as a signal spike.
• Check for nearby aftermarket accessories that may be radiating interference.
• After repair, clear codes and confirm stable sensor output on a test drive.

Can I Keep Driving?

ABS, ATC, and ESP brake-system codes should be handled conservatively. Normal base braking continues when ABS or stability functions are disabled, but the safety benefit of anti-lock and stability intervention is not available. If a brake warning lamp, red stop indicator, loss of braking performance, steering concern, or uncharacteristic vehicle behavior appears alongside this code, stop safely and follow OEM or fleet guidance before continuing.

Related Lookup Pages

• FMI 14 explanation
• Bendix manufacturer hub
• ABS / ATC / ESP fault codes
• ABS Light symptom page
• Brake Warning Light symptom page
• Search this code