U05AA Code - Implausible Data Received From Charge Air Cooler Coolant Pump
Quick Answer
To improve engine performance the Charge Air Cooler (CAC) system is used to reduce the temperature of the air entering the combustion chambers. Common causes include Faulty Auxiliary Coolant Pump, Auxiliary Coolant Pump harness is open or shorted, Auxiliary Coolant Pump 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
- U05AA indicates Implausible Data Received From Charge Air Cooler Coolant Pump.
- Common causes
- Common causes include Faulty Auxiliary Coolant Pump, Auxiliary Coolant Pump harness is open or shorted, Auxiliary Coolant Pump 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 U05AA Description
The Auxiliary Coolant Pump is a smart device that contains a LIN Bus communication module and a coolant pump. To maintain a desired charge air temperature, the PCM sends a pump speed command over the LIN bus to the internal Auxiliary Coolant Pump. The internal Auxiliary Coolant Pump module controls the pump speed/coolant flow rate using Pulse-Width Modulation (PWM). The Auxiliary Coolant Pump assembly monitors for internal system circuit and performance failures. If a fault occurs the Auxiliary Coolant Pump module sends the fault information to the PCM through the dedicated LIN Bus. The PCM processes the information received, then sets the correlating fault.
What are the Possible Causes of the DTC U05AA?
- Faulty Auxiliary Coolant Pump
- Auxiliary Coolant Pump harness is open or shorted
- Auxiliary Coolant Pump circuit poor electrical connection
- Faulty Powertrain Control Module (PCM)
How to Fix the DTC U05AA?
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 U05AA 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.
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Information for Specific Makes
- U05AA Chrysler — Implausible Data Received From Charge Air Cooler Coolant Pump
- U05AA Dodge — Implausible Data Received From Charge Air Cooler Coolant Pump
- U05AA Jeep — Implausible Data Received From Charge Air Cooler Coolant Pump
- U05AA RAM — Implausible Data Received From Charge Air Cooler Coolant Pump
Frequently Asked Questions about U05AA Code
1. What are the common symptoms of OBDII code U05AA?
The common symptoms of OBDII code U05AA include poor engine performance, hesitation during acceleration, and potentially an illuminated check engine light.
2. What could cause the OBDII code U05AA to be triggered?
The OBDII code U05AA is typically triggered when the engine control module detects implausible data received from the charge air cooler coolant pump, indicating a malfunction or communication issue.
3. How serious is the OBDII code U05AA?
While the severity can vary, it is important not to ignore the OBDII code U05AA as it can lead to reduced engine performance, potential overheating issues, and other related problems if left unresolved.
4. What are some possible repair tips for addressing OBDII code U05AA?
Some repair tips for addressing OBDII code U05AA include checking the charge air cooler coolant pump for proper operation, inspecting the wiring and connectors for any damage, and resetting the fault code to see if it reoccurs.
5. Can I continue driving with the OBDII code U05AA present?
It is not recommended to continue driving with the OBDII code U05AA present, as it can affect the performance and reliability of your vehicle. It is best to address the issue promptly to prevent further damage.
6. How can I diagnose the OBDII code U05AA at home?
Diagnosing the OBDII code U05AA may require a professional diagnostic scan tool to retrieve specific data related to the charge air cooler coolant pump and its communication with the engine control module.
7. Is it possible to reset the OBDII code U05AA without fixing the underlying issue?
While it is possible to clear the fault code temporarily, it is crucial to address the underlying issue triggering the OBDII code U05AA to prevent it from reoccurring and potentially causing more significant problems.
8. Are there any common culprits for triggering the OBDII code U05AA?
Common culprits for triggering the OBDII code U05AA include a faulty charge air cooler coolant pump, damaged wiring or connectors, a communication breakdown between components, or a malfunctioning engine control module.
9. How much should I expect to pay for repairs related to the OBDII code U05AA?
The cost of repairs for the OBDII code U05AA can vary depending on the specific cause of the issue. It is advisable to consult with a professional mechanic to diagnose the problem accurately and provide an estimate for the repairs.
10. Can a DIY enthusiast with automotive knowledge fix the OBDII code U05AA?
Depending on the level of expertise and access to tools, a DIY enthusiast with automotive knowledge may be able to address the OBDII code U05AA by inspecting the charge air cooler coolant pump, checking wiring connections, and resetting the fault code.
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