P017E: How to Diagnose & Fix — Cylinder Head Temperature Sensor Circuit Intermittent/Erratic
2 vehicles · 1 makes
How to diagnose and fix P017E: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Audi RS Q8 · 2020–2021
Audi TSB 2062951/4 covers all 2020 RS Q8 vehicles and early-production 2021 vehicles built before chassis WUARRDF11MD011353 (the first vehicle with the improved part) when a red coolant warning appears and the engine controller stores P218100, P017B00, P017C00 or P017E00. Audi documents that a damaged or pinched O-ring can allow moisture to reach coolant temperature sender G407. The fault is in this sensor, not in the turbo coolant hoses or pump.
Common Symptoms
- Red coolant warning lamp
How to Fix
Have the vehicle checked with Audi Guided Fault Finding and inspect G407 and its O-ring. Replace G407 only if the O-ring is damaged or pinched and the diagnosis matches the bulletin; follow the related Audi diagnostic path if additional listed faults are stored. Do not replace turbo coolant hoses, pumps or other cooling parts based on this warning alone.
Sources for this issue (1)
Audi SQ8 · 2020–2021
Audi TSB 2062951/4 covers all 2020 SQ8 vehicles and early-production 2021 vehicles built before chassis WA1CWBF17MD010458 (the first vehicle with the improved part) when a red coolant warning appears and the engine controller stores P218100, P017B00, P017C00 or P017E00. Audi documents that a damaged or pinched O-ring can allow moisture to reach coolant temperature sender G407. This is a sensor fault, not a sign of a failing hose or pump.
Common Symptoms
- Red coolant warning lamp
How to Fix
Have the vehicle checked with Audi Guided Fault Finding and inspect G407 and its O-ring. Replace G407 only if the O-ring is damaged or pinched and the diagnosis matches the bulletin; follow the related Audi diagnostic path if additional listed faults are stored. Do not replace turbo coolant hoses, pumps or other cooling parts from this card alone.
Sources for this issue (1)
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P017E code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P017E mean?
P017E stands for "Cylinder Head Temperature Sensor Circuit Intermittent/Erratic." The engine control module sees the cylinder head temperature sensor signal drop out or change erratically - typically an intermittent open circuit or loose contact (VW-group text: 'open circuit/loose contact'). While the signal is lost the ECM cannot determine head temperature and substitutes a fail-safe value, usually with maximum fan operation and a coolant warning. On the Audi 4.0T V8 (TSB 2062951) this comes from corrosion or contact damage inside coolant temperature sender G407 after water intrusion past a failed O-ring.
What are the most common causes of P017E?
The most common causes of P017E are: Corroded or damaged contacts inside the G407 coolant temperature sender following moisture ingress (Audi TSB 2062951), Loose, backed-out, or unseated sensor connector, Broken or chafed wire between the sensor and ECM, Internally open sensor element. The specific cause varies by vehicle.
How much does it cost to fix P017E?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by P017E?
Au7o has documented P017E across 2 vehicle models from 1 manufacturers: Audi.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.