Land Rover P26CB-72
73 may be present. • The slide mechanism for the variable pump is sticking and 100% duty cycle of the fan is normal operation. Status: • A revised coolant pump design and PCM softw
Common search variants: P26CB72 · P26CB 72 · P26CB_72 · Search ignores case and common separators.
Quick answer
For affected 2019–2020 US Land Rover Range Rover vehicles, DTC P26CB-72 is documented in manufacturer communications concerning the AJ20P4 variable coolant pump. The evidence describes a sticking pump slide mechanism and may involve an engine cooling fan operating at 100% duty cycle.
This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.
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1. What does P26CB-72 mean?
For affected 2019–2020 US Land Rover Range Rover vehicles, DTC P26CB-72 is documented in manufacturer communications concerning the AJ20P4 variable coolant pump. The evidence describes a sticking pump slide mechanism and may involve an engine cooling fan operating at 100% duty cycle.
2. Technical explanation
NHTSA-posted Land Rover manufacturer communications state that P26CB-72 can be set when the variable coolant-pump shroud is slow to respond to a request to open or close. A separate communication describes the variable-pump slide mechanism as sticking. The communications state that 100% cooling-fan duty cycle is normal operation in this condition. They also note that high fan speed may occur because of other vehicle requirements, including HVAC.
3. What system is affected?
Engine cooling system: AJ20P4 variable coolant pump and engine cooling fan/PCM control.
4. How serious is this code?
Not yet established by verified evidence.
5. Symptoms you may notice
- Engine cooling fan may run at full or high speed.
- A loud noise from the front of the vehicle may be reported.
- The Check Engine/MIL may be on.
- DTC P26CB-72 may be present.
- DTC P2B61-73 may also be present.
6. Possible causes
- The variable coolant-pump slide mechanism is described as sticking.
- The variable coolant-pump shroud may be slow to respond to a request to open or close.
- High fan speed may also result from other vehicle requirements, including HVAC.
7. Can I still drive the vehicle?
Not yet established by verified evidence.
8. Can I charge the vehicle?
Not yet established by verified evidence.
9. What you can safely do
- Arrange diagnosis by an authorized Land Rover service provider.
- Provide the stored DTCs and report whether the cooling fan is operating loudly or at high speed.
- Do not assume that fan operation at 100% duty cycle alone identifies the root cause; the manufacturer communication notes other vehicle requirements, including HVAC, can command high fan speed.
10. Step-by-step troubleshooting
- Confirm whether P26CB-72 is stored.
- Check for the companion DTC P2B61-73.
- Have service personnel assess the variable coolant-pump response and applicable PCM software using Land Rover procedures.
11. When to contact service
Contact an authorized Land Rover retailer/service provider for diagnosis and to determine whether the applicable coolant-pump hardware and PCM software actions apply to the vehicle.
12. What the service center may check
- Verify applicability by VIN, vehicle configuration, and installed engine.
- Read and document DTC P26CB-72 and any P2B61-73.
- Assess the variable coolant pump/shroud response to open and close requests.
- Determine whether applicable revised coolant-pump hardware and PCM software are available for the vehicle.
13. Possible repair or resolution
- The April 2020 manufacturer communication states that a revised coolant-pump design and PCM software update were planned to resolve the complaint; it also states ICA hardware was available at that time.
- The November 2020 communication states that the revised calibration changes how the vehicle reacts, while these DTCs may still be stored. The exact repair outcome for an individual vehicle is not yet established by the supplied evidence.
14. Affected vehicles
- Land Rover Range Rover · 2019–2020 · US
15. Related TSBs / service bulletins
- NHTSA Manufacturer Communication 10174474, published April 9, 2020: “Engine Cooling Fan runs at full speed,” covering 2018-onward listed AJ20P4 applications. It identifies P26CB-72 and/or P2B61-73, a sticking variable-pump slide mechanism, and planned revised pump/PCM actions. URL: https://static.nhtsa.gov/odi/tsbs/2020/MC-10174474-0001.pdf
- NHTSA Manufacturer Communication 10183545, published November 19, 2020: “AJ20P4 COOLANT PUMP 18MY – Onward.” It states P26CB-72 and P2B61-73 can set when the variable-pump shroud responds slowly to opening/closing requests and discusses revised calibration behavior. URL: https://static.nhtsa.gov/odi/tsbs/2020/MC-10183545-0001.pdf
16. Recall information
- Not yet established by verified evidence.
17. Official manufacturer information
Verified applicability supplied: Land Rover Range Rover, model years 2019–2020, United States. The evidence is from NHTSA-posted Land Rover manufacturer communications, not a recall notice.
19. Frequently asked questions
What does P26CB-72 indicate in the supplied Land Rover evidence?
It is associated with the AJ20P4 variable coolant pump. The evidence states the pump shroud may be slow to respond to open/close requests and describes the pump slide mechanism as sticking.
Why is the cooling fan running loudly or at full speed?
The April 2020 communication states that 100% fan duty cycle is normal operation when the variable-pump slide mechanism is sticking. The November 2020 communication also states that high fan speed may be required for other reasons, such as HVAC.
Can P2B61-73 occur with P26CB-72?
Yes. Both supplied manufacturer communications identify P2B61-73 as a DTC that may be present with P26CB-72.
Is there a documented fix?
The supplied April 2020 communication states that revised coolant-pump hardware and a PCM software update were intended to resolve the complaint. Individual vehicle applicability and repair outcome require service verification.