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 EX-L, AWDFACTORY 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
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.