FAQ
TL;DR: BKP 2.0 TDI Passat (140 hp) with sporadic P1267/P0180 often shows "regulation limit exceeded"; confirm with VCDS first. This FAQ helps BKP owners triage injector and fuel-temp faults cheaply. [Elektroda, pitbul455, post #17026370]
Why it matters: It steers you to wiring and measurement checks before spending on injectors.
Quick Facts
- Example case: Passat B6, 2.0 TDI BKP (140 hp) with two sporadic DTCs—P1267 (N242) and P0180 (G81). [Elektroda, pitbul455, post #17026370]
- Real-world symptom: normal start and power, no MIL; faults visible only on VCDS scan. [Elektroda, pitbul455, post #17026370]
- Diagnostics first: use VCDS Measuring Block 018 to evaluate injector control and wiring. [Elektroda, airwolff, post #17081605]
- Proven fix in-thread: improve injector loom contacts; solder/repair the G81 fuel temp sensor plug. [Elektroda, pitbul455, post #17098370]
- Context: injectors replaced ~120,000 km by service action; faults logged again at 239,092–239,650 km. [Elektroda, pitbul455, post #17026370]
What does P1267 mean on a VW 2.0 TDI BKP?
P1267 indicates Cylinder 3 Injector Valve (N242) control hit its limit. Symptoms include drive issues, reduced power, rough running, and higher emissions. Causes include exceeded regulation times or contact resistance in the injector circuit. Start by inspecting the injector and its wiring. Review VCDS Measuring Block 018 and check harness resistance. "Check injectors and injector wiring." Clear codes and retest. [Elektroda, airwolff, post #17081605]
What does P0180 Fuel Temperature Sensor A (G81) circuit fault indicate?
P0180 points to a fault in the fuel temperature sensor circuit. Expect a damaged G81 sensor, a poor connector, or broken wiring. Inspect the plug for looseness or corrosion. Check continuity and supply/ground on the two or three relevant wires. Repair or replace the connector or sensor as needed, then clear codes and test. [Elektroda, airwolff, post #17081605]
How do I fix sporadic P1267/P0180 without replacing injectors?
Address contact issues first. Improve and re-seat injector loom contacts at the pump‑duse injectors. Repair the fuel temperature sensor plug by soldering the wires to restore continuity. Clear DTCs, drive several trips, and re-scan. This resolved the thread case without injector replacement. [Elektroda, pitbul455, post #17098370]
Where is the pump‑injector wiring loom on the BKP, and how do I access it?
The injector wiring loom sits under the valve cover and connects to each unit injector. It passes through the cylinder head to an external connector. Access it by removing the engine cover and valve cover, then unplugging the head pass‑through connector. Keep the area clean to avoid contamination. [Volkswagen SSP 314]
How can I test injector regulation with VCDS (Measuring Block 018)?
Open VCDS, select Engine 01, then Measuring Blocks, and view Block 018. Observe injector regulation values and switching behavior at idle and during light revs. Look for outliers relative to other cylinders. Log data and compare after any wiring or contact repairs. Use this before considering injector replacement. [Elektroda, airwolff, post #17081605]
What should I log in VCDS Group 023, and why?
Log Group 023 during a normal road drive. Capture live injector performance to help spot intermittent behavior under load and speed changes. Save the log and review for deviations or repeats. Sharing this log helps targeted diagnosis and avoids guesswork. [Elektroda, domex32, post #17083443]
Can poor injector‑loom contacts cause limp mode on a BKP?
Yes. Poor contacts can trigger injector control faults that reduce power and cause driveability problems. The ECU may protect itself by lowering available torque, perceived as limp mode. Fixing wiring contact issues often restores normal power after clearing codes. [Elektroda, airwolff, post #17081605]
Is it normal to have these codes with no warning lights or power loss?
Yes. The example car started normally, pulled fine, and showed no warning lights. The driver noticed nothing until scanning with VCDS. Sporadic, contact‑related faults can remain invisible in daily driving until they worsen. [Elektroda, pitbul455, post #17026370]
Do I need to replace injectors when P1267 appears?
Not immediately. Verify wiring and contacts first, then measure with VCDS. The thread case cleared by improving loom contacts and repairing the G81 connector. Replace or refurbish injectors only after tests point to a true injector defect. [Elektroda, pitbul455, post #17098370]
What do "regulation limit exceeded" and an internal error counter mean?
They show the ECU hit its control limit and recorded intermittent events. In the example, the internal error counter reached 38 and error rate 9, at about 239,650 km. That pattern usually indicates contact or wiring instability rather than a hard failure. [Elektroda, pitbul455, post #17026370]
How do I repair a damaged G81 fuel temperature sensor connector?
- Inspect the G81 plug; resolder or replace the wires to the connector.
- Ensure solid strain relief and seal the repair against moisture.
- Clear codes, road‑test, and re‑scan to confirm the fix.
This resolved the fuel temp fault in the thread. [Elektroda, pitbul455, post #17098370]
What else should I check before spending money on parts?
Check injector corrections in VCDS, perform a buzzer/actuation test if available, and verify compression. These checks help separate wiring issues from mechanical faults. As one expert advised, "Check corrections, beeps, and compression." Do these before authorizing injector work. [Elektroda, szymitsu21, post #17081623]
After cleaning contacts, how do I confirm the repair worked?
Clear DTCs, drive several cycles in mixed conditions, then re‑scan with VCDS. If the injector and fuel‑temperature codes do not return and drivability remains normal, the repair is effective. Monitor occasionally for recurrence. [Elektroda, pitbul455, post #17098370]
What did "pump injection beam" mean in this thread?
It referred to the pump‑duse injector wiring harness having poor contact. Restoring proper contact at the harness resolved the intermittent injector code in this case. [Elektroda, VENDETTI, post #17082451]
What if cleaning contacts and soldering the plug doesn’t stop the codes?
Then suspect a defective component. Replace the G81 sensor or the injector wiring harness if tests fail. If VCDS and resistance checks implicate an injector, consider refurbishment or replacement after compression checks. The expert notes a "defective module" may require replacement. [Elektroda, airwolff, post #17081605]
Congratulations on your knowledge and experience.
