Volkswagen P261A00: Troubleshooting the Secondary Coolant Pump Circuit

Volkswagen P261A00: Troubleshooting the Secondary Coolant Pump Circuit

The diagnostic trouble code (DTC) P261A00 stands for “Coolant Pump B Control Circuit Open.” This code indicates that there is an electrical issue with the secondary coolant pump, specifically an open circuit in the control wiring.

How Serious is This Issue?

Severity: Moderate to High

While not immediately critical, the P261A00 code should not be ignored. The secondary coolant pump plays an important role in maintaining proper engine temperature, especially in modern Volkswagen engines with complex cooling systems. If left unaddressed, it could potentially lead to overheating and more severe engine problems.

Is it Safe to Drive with This DTC Code?

It is generally not recommended to drive for extended periods with the P261A00 code active. While the vehicle may still be operational, continuing to drive could potentially cause further damage to the engine or cooling system components. Short trips to a repair facility are usually acceptable, but it’s best to address the issue promptly.

Symptoms and Common Causes of This DTC Code


  • Illuminated Check Engine Light
  • Potential overheating issues
  • Possible reduced engine performance
  • Coolant pump may not be operating

Common Causes

  • Faulty coolant pump (Pump B)
  • Damaged or corroded wiring to the coolant pump
  • Loose or disconnected electrical connector
  • Failed coolant pump relay
  • Issues with the engine control module (ECM)

How Can I Fix It?

Fixing the P261A00 code typically involves the following steps:

  1. Use a diagnostic scanner to confirm the code and check for any additional related codes.
  2. Inspect the wiring and connectors leading to the coolant pump for any visible damage or corrosion.
  3. Check the coolant pump relay and replace if necessary.
  4. Test the coolant pump itself for proper operation.
  5. If all else checks out, the pump may need to be replaced.
  6. After repairs, clear the code and test drive to ensure the problem is resolved.

Can I Fix This DTC Code Myself?

While some basic diagnostic steps can be performed at home, fixing this issue often requires specialized tools and knowledge of the cooling system. Unless you have advanced automotive repair experience, it’s recommended to have a professional mechanic diagnose and repair this issue.

What Parts Might Need Replacement and How Much Will the Repair Cost?

Potential Parts for Replacement

  • Coolant Pump B
  • Wiring harness or connectors
  • Coolant pump relay
  • In rare cases, the engine control module (ECM)

Estimated Repair Costs

  • Diagnosis: $75-$150
  • Coolant pump replacement: $200-$600
  • Wiring repairs: $100-$300
  • ECM replacement (if needed): $500-$1000+

Will the Repair Be Expensive?

The repair cost can range from moderate to expensive, depending on the underlying cause. If it’s a simple wiring issue or relay replacement, costs may be relatively low. However, if the coolant pump itself needs replacement or there are issues with the ECM, the repair could be more expensive.

Can I Reset the DTC Code Myself?

While it’s possible to clear the code using an OBD-II scanner, this should only be done after the underlying issue has been fixed. Simply clearing the code without addressing the root cause will likely result in the code returning quickly.

Will It Affect Performance or Fuel Efficiency?

The P261A00 code may not directly affect performance or fuel efficiency in the short term. However, if the coolant pump is not functioning properly, it could lead to engine overheating issues, which would then impact performance and potentially cause increased fuel consumption.

How Can I Prevent It in the Future?

To help prevent this issue in the future:

  • Follow the manufacturer’s recommended maintenance schedule.
  • Regularly inspect coolant levels and the condition of coolant hoses.
  • Address any cooling system issues promptly.
  • Keep the battery and electrical system in good condition to prevent voltage issues.
  • Consider having the cooling system flushed and serviced at recommended intervals.

By staying proactive with maintenance and addressing any warning signs early, you can help reduce the likelihood of experiencing this and other cooling system-related issues in your Volkswagen vehicle.


  1. OBD-Codes
  2. PartsAvatar
  3. YouTube Video 1
  4. YouTube Video 2
  5. RepairPal
  6. VW Audi Forum
  7. AudiWorld Forum
  8. Ross-Tech Wiki
  9. YouTube Video 3
  10. OBDeleven Forum
  12. YouTube Video 4
  13. YouTube Video 5

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