P1604 Code - Loss Of IPC Serial Data Conditions
Quick Answer
With the engine running engine speed over 500 rpm for 10 continuous seconds, the Powertrain Control Module (PCM) detects an invalid serial data signal or no serial data from the Instrument Panel Cluster (IPC) to PCM for 11 seconds. Common causes include Faulty Instrument Panel Cluster (IPC), Instrument Panel Cluster harness is open or shorted, Instrument Panel Cluster circuit poor electrical connection. 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
- P1604 indicates Loss Of IPC Serial Data Conditions.
- Common causes
- Common causes include Faulty Instrument Panel Cluster (IPC), Instrument Panel Cluster harness is open or shorted, Instrument Panel Cluster circuit poor electrical connection.
- 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 P1604 Description
What are the Possible Causes of the DTC P1604?
- Faulty Instrument Panel Cluster (IPC)
- Instrument Panel Cluster harness is open or shorted
- Instrument Panel Cluster circuit poor electrical connection
How to Fix the DTC P1604?
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 P1604 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 P1604 code?
Need more information on how to fix the P1604 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1604 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- P1604 Audi — Engine Control Module Defective
- P1604 Buick — Loss Of IPC Serial Data Conditions
- P1604 Cadillac — Loss Of IPC Serial Data Conditions
- P1604 Chevrolet — Loss Of IPC Serial Data Conditions
- P1604 Chrysler — PCM Internal Dual-Port RAM Read/Write Integrity Failure
- P1604 Dodge — PCM Internal Dual-Port RAM Read/Write Integrity Failure
- P1604 GMC — Loss Of IPC Serial Data Conditions
- P1604 Hyundai — No ID From ECU
- P1604 Jeep — PCM Internal Dual-Port RAM Read/Write Integrity Failure
- P1604 Lexus — Startability Malfunction
- P1604 RAM — PCM Internal Dual-Port RAM Read/Write Integrity Failure
- P1604 Saab — Engine Control Module Defective
- P1604 Scion — Startability Malfunction
- P1604 Toyota — Startability Malfunction
- P1604 Volkswagen — Engine Control Module Defective
Frequently Asked Questions about P1604 Code
1. What are the common symptoms of OBDII code P1604 (Loss Of IPC Serial Data Conditions)?
- Common symptoms include issues with the instrument cluster, such as the gauges not working properly, warning lights flickering, or complete loss of display.
2. What are some possible causes of OBDII code P1604?
- Potential causes of this code include faulty wiring or connections between the instrument cluster and the ECM, a malfunctioning instrument cluster module, or an issue with the ECM itself.
3. How can I diagnose the underlying issue causing OBDII code P1604?
- Diagnosis typically involves checking the wiring and connections between the instrument cluster and the ECM for any damage or loose connections. Additionally, testing the instrument cluster and ECM for proper functionality is recommended.
4. Is it safe to continue driving with OBDII code P1604 present?
- It is not recommended to drive with this code present, as it can lead to inaccurate readings from the instrument cluster, potentially affecting the vehicle's performance and safety.
5. Can OBDII code P1604 be repaired without professional help?
- Repairing this code may require advanced diagnostic tools and knowledge of automotive electrical systems. It is recommended to seek assistance from a qualified mechanic for proper diagnosis and repair.
6. Are there any quick fixes or temporary solutions for OBDII code P1604?
- Quick fixes such as checking and securing the wiring connections between the instrument cluster and ECM may temporarily resolve the issue. However, a permanent solution should involve a thorough diagnosis and repair.
7. Will resetting the OBDII system clear the P1604 code?
- Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing P1604 is not addressed, the code is likely to reappear.
8. Can extreme temperatures or environmental conditions trigger OBDII code P1604?
- Extreme temperatures or environmental conditions can potentially affect the electrical connections and components related to the instrument cluster, leading to the appearance of P1604.
9. How much does it typically cost to repair OBDII code P1604?
- The cost of repairing this code can vary depending on the underlying cause and the specific components that need to be addressed. It is advisable to obtain a diagnostic assessment from a mechanic to determine the exact cost.
10. Is OBDII code P1604 a common issue in certain vehicle makes or models?
- While this code can occur in various vehicles, it may be more common in certain makes or models known for electrical issues or instrument cluster malfunctions.
Discuss the causes and fixes for P1604 OBDII Code
Code P1604 comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
