P16E2 Honda Code - PGM-FI-ACG LIN Communication Error
Quick Answer
The P16E2 Honda diagnostic trouble code (DTC) refers to a PGM-FI-ACG LIN Communication Error. Common causes include Faulty ACG system components, Damaged wiring or connectors in the LIN bus network, Software issues with the PCM. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P16E2 Honda indicates PGM-FI-ACG LIN Communication Error.
- Common causes
- Common causes include Faulty ACG system components, Damaged wiring or connectors in the LIN bus network, Software issues with the PCM.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P16E2 Honda Description
The P16E2 Honda diagnostic trouble code (DTC) refers to a PGM-FI-ACG LIN Communication Error. This code indicates a problem with the communication between the Powertrain Control Module (PCM) and the Active Control Engine Mount (ACG) LIN bus network. The ACG system is responsible for controlling engine vibrations and noise by adjusting the engine mounts. When this communication error occurs, it can lead to issues with engine performance, fuel efficiency, and overall drivability of the vehicle.
Common Causes of P16E2 Honda
- Faulty ACG system components.
- Damaged wiring or connectors in the LIN bus network.
- Software issues with the PCM.
- Corrosion or poor connections in the communication circuit.
- Electrical interference from other vehicle components.
Symptoms of P16E2 Honda
- Engine vibrations are more noticeable than usual.
- Rough idle or stalling when the vehicle is stationary.
- Decrease in fuel efficiency.
- Engine performance issues such as hesitation or lack of power.
- Dashboard warning light indicating a problem with the engine or transmission.
How to Fix P16E2 Honda
- Diagnose the specific cause of the communication error using a diagnostic scan tool.
- Inspect the ACG system components and wiring for any visible damage or corrosion.
- Test the communication circuit between the PCM and ACG system for continuity and proper voltage levels.
- Repair or replace any faulty components, wiring, or connectors as needed.
- Clear the DTC and perform a road test to verify that the issue has been resolved.
Cost to Fix P16E2 Honda
The cost of repairing a P16E2 Honda code can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. Typically, the parts required for the repair may range from $100 to $300, while the labor cost could be between $100 and $300. Overall, the total repair cost could be in the range of $200 to $600. However, it's important to note that these estimates are general guidelines, and actual costs may vary based on the location, vehicle make and model, and the extent of the repairs needed. It's recommended to consult with a professional mechanic for a more accurate cost estimate.
Need more information about the P16E2 Honda code?
Need more information on how to fix the P16E2 Honda code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P16E2 Honda code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P16E2 Honda Code
1. What are the common symptoms of OBDII code P16E2 Honda (PGM-FI-ACG LIN Communication Error)?
- Common symptoms include rough idling, reduced engine performance, and the illumination of the check engine light.
2. What are some possible causes of the P16E2 Honda trouble code?
- The code can be triggered by issues with the LIN communication network, faulty sensors, damaged wiring, or a malfunctioning powertrain control module (PCM).
3. How can I diagnose the P16E2 code in a Honda vehicle?
- Diagnosing the code typically involves using an OBDII scanner to read the code, checking the communication network for faults, inspecting sensor connections, and testing the PCM.
4. Can a DIY enthusiast repair the P16E2 code at home?
- While some basic troubleshooting like checking connections and fuses can be done at home, diagnosing and repairing the root cause of the code may require professional tools and expertise.
5. Is it safe to continue driving with the P16E2 code present?
- It is generally not recommended to drive with the P16E2 code active as it can lead to poor engine performance and potential damage if left unresolved.
6. How much does it typically cost to repair the P16E2 Honda trouble code?
- Repair costs can vary depending on the underlying issue, but they may range from a simple sensor replacement costing a couple of hundred dollars to more complex repairs involving the PCM that could cost over a thousand dollars.
7. Are there any common quick fixes for the P16E2 trouble code?
- Quick fixes like checking and tightening sensor connections, resetting the PCM, or replacing damaged wiring may sometimes resolve the issue, but a proper diagnosis is recommended.
8. Can a faulty battery or alternator cause the P16E2 code in a Honda?
- Yes, a weak battery or alternator can sometimes cause voltage fluctuations that disrupt the LIN communication network and trigger the P16E2 code.
9. How long does it typically take to repair the P16E2 Honda trouble code?
- The repair time can vary depending on the exact cause of the code and the availability of parts, but it may take a few hours to a day for a professional technician to diagnose and fix the issue.
10. Does the P16E2 code affect the safety of driving a Honda vehicle?
- While the code itself may not pose an immediate safety risk, it can lead to performance issues that may impact the vehicle's drivability, so it's best to address the problem promptly.
Discuss the causes and fixes for P16E2 Honda OBDII Code
-
I have a 2012 Honda Civic EX-L 1.8L with this code, P16E2. The code never triggered the check engine light. Some have said its a comm error between the alternator and the battery. BUT, if you look on the negative terminal of one of these cars, there is a part that apparently monitors battery condition, load status, compensation, charging, etc. Everything makes sense now. I've replaced the alternator multiple times, the battery expired years ahead of its service life, there are obvious power surges, the battery reads at 12.5V WHILE RUNNING, until the headlights are kicked on and it boosts to 14-14.5V. Part No.: 38920-TR0-A02
Sensor Assy., Battery (L) is paid for (70 something and some change) and en route to me from Honda. I will replace and let you all know if this resolved the issue. Wish me luck! -
Well, it held a year...BUT THE SAME THING HAS HAPPENED THE THIRD TIME. BATTERY REPLACED, ELD REPLACED, BATTERY SENSOR REPLACED, MULTIPLE ALTERNATORS. Nobody has had a definitive solution for this. I'm giving up and taking her to the dealership.
-
I have the P16E2 error on my 2017 honda civic ex. The starter, alternator and ecm where replaced. This error has yet to be fixed. I'm documenting my experience on youtube, which can be found by simply searching my name
-
Thanks for sharing—sounds like you’ve already done a lot of work. The P16E2 code points to a LIN (Local Interconnect Network) communication issue between the ECM and alternator. Even though you’ve replaced the starter, alternator, and ECM, the code can still come back if there's a problem in the LIN bus wiring or ground circuit.
Here’s what I’d check next:
-
LIN communication wire – Make sure the single-wire LIN line between the alternator and ECM isn’t damaged, pinched, or corroded. Even slight resistance can interrupt the signal.
-
Grounds and connectors – Double-check all main ground points, especially those near the battery and engine block. Bad grounds can cause communication errors even when parts are new.
-
Aftermarket alternator? – If the new alternator isn’t OEM or fully compatible with the LIN protocol Honda uses, it can cause this code. If it’s not Honda-branded or Denso, consider trying an OEM unit.
-
ECM not properly coded or updated – After ECM replacement, some models need reprogramming or software updates to reestablish proper LIN communication. Dealer-level tools or a good scan tool can check this.
Since you’re documenting the process on YouTube, that’s actually a great idea—this issue is frustratingly common, and clear answers are hard to find. If you want, I can help review wiring diagrams or pinouts based on your engine type.
-
-
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.