P1605 Code - Engine Rough Idling
Quick Answer
After starting the engine, this Diagnostic Trouble Code (DTC) is stored if the engine speed drops below the set speed. Common causes include Air Leak in Intake System, Faulty Mass Air Flow (MAF) sensor, Faulty Engine Coolant Temperature Sensor. 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
- P1605 indicates Engine Rough Idling.
- Common causes
- Common causes include Air Leak in Intake System, Faulty Mass Air Flow (MAF) sensor, Faulty Engine Coolant Temperature Sensor.
- 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.
Code P1605 Description
What are the Possible Causes of the DTC P1605?
- Air Leak in Intake System
- Faulty Mass Air Flow (MAF) sensor
- Faulty Engine Coolant Temperature Sensor
- Faulty Fuel Pump
- Faulty Throttle Body Assembly
- Faulty Engine Control Module (ECM)
How to Fix the DTC P1605?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1605 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P1605 code?
Need more information on how to fix the P1605 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1605 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- P1605 Buick — Loss Of HVAC Serial Data
- P1605 Cadillac — Loss Of HVAC Serial Data
- P1605 Chevrolet — Loss Of HVAC Serial Data
- P1605 Ford — PCM Keep Alive Memory Test Error Conditions
- P1605 GMC — Loss Of HVAC Serial Data
- P1605 Hyundai — Acceleration Sensor Malfunction
- P1605 Infiniti — Automatic Transmission Communication
- P1605 Lexus — Engine Rough Idling
- P1605 Lincoln — PCM Keep Alive Memory Test Error Conditions
- P1605 Mazda — PCM Keep Alive Memory Test Error Conditions
- P1605 Mercedes-Benz — Rough Road Detected By Signal From Comparing Wheel Speeds
- P1605 Mercury — PCM Keep Alive Memory Test Error Conditions
- P1605 Nissan — Automatic Transmission Communication
- P1605 Saab — Engine Control Module Defective
- P1605 Scion — Engine Rough Idling
- P1605 Toyota — Engine Rough Idling
Frequently Asked Questions about P1605 Code
1. What are the common symptoms of OBDII code P1605 (Engine Rough Idling)?
- Common symptoms include rough idling, engine stalling, poor acceleration, and in some cases, the vehicle may struggle to start.
2. What are the possible causes of OBDII code P1605?
- The code P1605 can be caused by issues such as a faulty idle air control valve, vacuum leaks, dirty fuel injectors, malfunctioning EGR valve, or a problem with the engine's sensors.
3. How can I diagnose the cause of engine rough idling associated with code P1605?
- Diagnosing the cause of engine rough idling involves performing a thorough inspection of the idle air control valve, checking for vacuum leaks, testing the EGR valve, cleaning or replacing fuel injectors, and scanning the engine sensors for any malfunctions.
4. Can a dirty air filter trigger OBDII code P1605?
- While a dirty air filter itself may not directly trigger code P1605, it can contribute to poor engine performance and rough idling, which may indirectly lead to the code being triggered.
5. How should I address OBDII code P1605 for engine rough idling?
- Addressing code P1605 involves identifying and fixing the root cause of the rough idling issue. This may include cleaning or replacing the idle air control valve, fixing vacuum leaks, cleaning the EGR valve, or replacing faulty sensors.
6. Is it safe to continue driving with OBDII code P1605?
- It is generally not recommended to continue driving with code P1605 as rough idling can lead to further engine damage and decreased fuel efficiency. It is best to address the issue promptly.
7. Can low-quality fuel trigger OBDII code P1605?
- While low-quality fuel may not directly trigger code P1605, it can lead to engine performance issues that may contribute to rough idling and potentially trigger the code.
8. How much does it typically cost to repair OBDII code P1605?
- The cost of repairing code P1605 can vary depending on the underlying cause. Costs may range from a few hundred dollars for simple fixes like cleaning sensors to over a thousand dollars for more complex repairs involving component replacements.
9. Will resetting the OBDII system clear code P1605?
- Resetting the OBDII system may clear the code temporarily, but it will likely return if the underlying issue causing the rough idling is not addressed. It is important to diagnose and fix the root cause of the problem.
10. Can a DIY enthusiast fix OBDII code P1605 at home?
- Depending on the specific cause of code P1605, some DIY enthusiasts with mechanical knowledge and the right tools may be able to address the issue at home. However, complex issues may require professional diagnosis and repair.
Discuss the causes and fixes for P1605 OBDII Code
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HI WE HAVE RECEIVED A NEW LAND CRUISER V8 VX-R AS IT IS FOR THE JOB WHICH REQUIERED A DRIVECAM ELECTRICIAN FIX THE CAMERA AND DURING THE FIRST 800 KM IT BROKE DOWN WITH THIS CODE P 1603 P 1604 P 1605 . I NEED HELP
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Hello I have a Honda civics hybrid 06 and I just bought it off with somebody but I don't know what's going on with the car at first when I first bought it it used to stall on me I bought a hold for it because it was cracked so I replaced that then I had another problem with the IMA wasn't charging so what I did was I turned it on and off switch it on off switch position to that I turned off a little bit left it off and then I turned it back on and out it's charged in the battery but now my issue is that after I did all that I got a new battery all that I am a light is off battery light off but now when I put it into drive it doesn't go it doesn't drive at all it just stays in the position don't know what's going on with my car maybe sometimes going out meet up
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Do you have any other code besides the P1605 code? Unfortunately, there are many things that could cause the symptom you have. An engine code will give you a better idea what the problem is.
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