Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Honda Pilot EliteFACTORY OEM SERVICE PROCEDURE
Active Control Engine Mount (ACM) DTCS
ACTIVE CONTROL ENGINE MOUNT (ACM)DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Detection Item |
|---|---|
| P0A14 | Front Engine Mount Actuator Circuit Malfunction |
| P0A15 | Front Engine Mount Actuator Control Circuit Low Current |
| P0AB6 | Rear Engine Mount Actuator Circuit Malfunction |
| P0AB7 | Rear Engine Mount Actuator Control Circuit Low Current |
| P150A | Engine Mount Control Unit Internal Circuit Malfunction 1 |
| P150B | Engine Mount Control Unit Internal Circuit Malfunction 2 |
| P150C | Engine Mount Control Unit Internal Circuit Malfunction 3 |
| P150D | Engine Mount Control Unit Internal Circuit Malfunction 4 |
| P150E | Engine Mount Control Unit Internal Circuit Malfunction (SOL Output) |
| P15AB - Refer to: DTC P15AB (Without Auto Idle Stop System) or DTC P15AB (With Auto Idle Stop System) |
Engine Mount Control Unit Power Source Circuit Low Voltage |
| P15B0 - Refer to: DTC P15B0, P15C0 (9-Speed A/T, 2019 2020 2021), or DTC P15B0, P15C0 (6-Speed A/T), (9-Speed A/T 2016 2017 2018) |
CKP Sensor Signal Malfunction |
| P15BE - Refer to: DTC P15BE, P15BF (9-Speed A/T, 2019 2020 2021) or DTC P15BE, P15BF (6-Speed A/T), (9-Speed A/T 2016 2017 2018) |
CMP Sensor Signal Malfunction |
| P15BF - Refer to: DTC P15BE, P15BF (9-Speed A/T, 2019 2020 2021) or DTC P15BE, P15BF (6-Speed A/T), (9-Speed A/T 2016 2017 2018) |
CMP Sensor Signal Intermittent Interruption |
| P15C0 - Refer to: DTC P15B0, P15C0 (6-Speed A/T), (9-Speed A/T 2016 2017 2018), or DTC P15B0, P15C0 (9-Speed A/T, 2019 2020 2021) |
CKP Sensor Signal Intermittent Interruption |
| P16C4 - Refer to: DTC P16C4 (2016 2017 2018), or DTC P16C4 (2019 2020 2021) |
Engine Mount Actuator Control Power Circuit Stuck OFF |
| P16C5 | Engine Mount Actuator Control Power Circuit Stuck ON |
| P16C6 | Engine Mount Actuator High Voltage During Function Test |
| U0029 - Refer to: DTC U0029 or DTC U0029, U0100 (ACM System 9-Speed A/T without CAN Gateway 2019 2020 2021) or DTC U0029, U0100 (ACM System 6-Speed A/T without CAN Gateway), (ACM System 9-Speed A/T without CAN Gateway 2016 2017 2018) . |
F-CAN Malfunction (BUS-OFF) |
| U0100 - Refer to: DTC U0029, U0100 (ACM System 6-Speed A/T without CAN Gateway), (ACM System 9-Speed A/T without CAN Gateway 2016 2017 2018) DTC U0029, U0100 (ACM System 9-Speed A/T without CAN Gateway 2019 2020 2021) or DTC U0029 . |
F-CAN Malfunction (ACM-PCM) |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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