2023 Audi A6 Check Engine Light & Harness Chafing TSB
For 2023 Audi A6, S6, and A6 allroad models, a persistent check engine light, often accompanied by DTCs such as P157600 or P260200, may indicate a chafing transmission wiring harness. Technical Service Bulletin 2070557/1 outlines the diagnosis and repair procedure to address this issue.
David Chen2023 Audi A6
Also applies to
- Audi A6 allroad
- 2023
- Audi S6
- 2023
Owners of 2023 Audi A6, S6, and A6 allroad vehicles may experience a persistent 2023 Audi A6 check engine light on their instrument cluster. This issue is often linked to a specific problem with the transmission wiring harness, leading to various diagnostic trouble codes (DTCs) being stored in the engine control unit J623.
Symptoms
The primary symptom reported by customers is the illumination of the "check engine lamp is illuminated in the instrument cluster". This warning light indicates that the engine control unit has detected a fault.
Fault Codes / DTCs
When the 2023 Audi A6 check engine light is active, a scan tool may reveal one or more of the following diagnostic trouble codes (DTCs) stored in the engine control unit J623 (diagnostic address 0001):
| Code | Description |
|---|---|
| P157600 | Right Electro-Hydraulic Engine Mount Solen.val. Short circuit to Ground (GND). |
| P157200 | Left Electro-Hydraulic Engine Mount Solen.val. Short circuit to Ground (GND). |
| P218100 | Cooling System Performance, symptom 15332 / 25214. |
| P260200 | Coolant Pump Control Circuit low. |
| P260000 | Coolant Pump Control Circuit open. |
Technical Background
The root cause of these issues, as identified in TSB 2070557/1, is that the wiring harness for the automatic gearbox is chafing. This chafing occurs specifically on the front left drive shaft, leading to damage that can cause electrical shorts or open circuits, triggering the aforementioned DTCs and the 2023 Audi A6 check engine light.
Production Solution
Audi has addressed this issue in new vehicle production. Vehicles manufactured after a certain point now feature a new gearbox wiring harness with modified routing to prevent chafing.
Repair Procedure Summary
For affected vehicles, technicians will perform a detailed inspection and repair process. The first step involves checking the wiring on the left side of the gearbox for any signs of chafing or damage. This inspection refers to Figure 1 in the technical document, which illustrates the transmission harness contact point.
If damage to the wiring harness is found, it can either be repaired using the wiring harness repair set VAS 1978 B, or if the damage is extensive, the harness will be replaced entirely. In cases of harness replacement, a photo of the original damage must be attached to DOC-IT for review.
Regardless of whether the harness is repaired or replaced, technicians must identify the gearbox wiring harness generation (06S or 07S, as shown in Figure 2). The routing procedure differs based on this generation:
- For generation 06S wiring harnesses: The harness must be routed through the circulation pump heat shield. Two buttons indicate the correct position, as depicted by a green arrow in Figure 3.
- For generation 07S wiring harnesses: This generation has a different shape and an additional retaining element (indicated by a yellow arrow in Figure 4). Crucially, generation 07S harnesses must not be routed through the circulation pump heat shield.
Important Warnings
Owners and technicians should be aware of the following critical information:
Gallery
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Frequently Asked Questions
- What does it mean if my 2023 Audi A6 check engine light is on with DTC P157600?
- If your 2023 Audi A6, S6, or A6 allroad has the check engine light on and stores DTC P157600, it indicates a 'Right Electro-Hydraulic Engine Mount Solen.val. Short circuit to Ground (GND)'. This is often caused by a chafing transmission wiring harness, as described in TSB 2070557/1.
- What is TSB 2070557/1 for 2023 Audi A6 models?
- TSB 2070557/1 is a Technical Service Bulletin issued by Audi for 2023 A6, S6, and A6 allroad vehicles. It addresses the issue of a chafing transmission wiring harness that can cause the check engine light to illuminate and trigger various DTCs, including P260200 and P260000 related to the coolant pump control circuit.
- How is the chafing transmission harness issue repaired on 2023 Audi A6 vehicles?
- The repair involves inspecting the transmission wiring harness for damage. If minor, it can be repaired using a VAS 1978 B repair set. If severely damaged, the harness is replaced. Crucially, the harness must be re-routed correctly based on its generation (06S or 07S) to prevent future chafing with the front left drive shaft.
- Will I be charged for a harness replacement if my 2023 Audi A6 is under warranty?
- The TSB indicates that warranty claims are covered for up to 48 months or 50,000 miles. However, it also notes that "Harness replacements without photos may be debited," implying that proper documentation is essential for warranty coverage. Always confirm with your Audi dealer regarding specific warranty terms.
Other revisions of this TSB
- 2021 Audi Q7, Q8, A8, S8 Red Coolant Warning Lamp TSBP218100
- 2017-2024 Audi Q7/SQ7 Corroded Splice Points Warning TSBP157600, P157200
- 2021-2023 Audi Q8 Corroded Splice Points TSBP157600, P157200
- 2019-2023 Audi Q8/SQ8/RS Q8 Corroded Splice Points TSB 2067785/1P157600, P157200
- 2021 Audi Q7/Q8 MIL On with Cooling System DTCsP218100
- 2021 Audi V8 TFSI Red Coolant Warning Lamp TSBP218100
- 2021 Audi Q7, Q8 MIL On with Cooling System DTCsP218100
- 2021 Audi Q8 MIL On with Cooling System DTCsP218100
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