OBD-II Generic Error Code P0950: How to Fix It

Q: Can I still drive my car with a P0950 code?

In most cases, yes — you can drive the vehicle, but with limitations. The automatic shifting function should still work, but the manual-shift or paddle-shift feature may be disabled or behave erratically. Some vehicles may enter a limp mode that restricts gear changes to protect the transmission. It is recommended to have the issue diagnosed and repaired promptly to avoid potential transmission damage from unexpected shifting behavior.

Q: What causes a P0950 code to appear?

The most common causes include a faulty shift position sensor or switch inside the shifter assembly, damaged or corroded wiring and connectors in the shift control circuit, a poor ground connection to the Transmission Control Module (TCM), a short to ground or short to power in the circuit wiring, or in rarer cases, a failed TCM. Intermittent codes are often caused by loose connectors or chafed wires that only lose contact during vibration or temperature changes.

Q: How much does it cost to fix a P0950 code?

Repair costs vary depending on the root cause. Fixing a damaged wire or cleaning a corroded connector may cost $50–$150 in labor if done professionally. Replacing a shift position sensor or switch typically costs $80–$250 in parts plus labor. If the Transmission Control Module (TCM) needs to be replaced and reprogrammed, costs can range from $300 to over $1,000 depending on the vehicle make and model. Always get a proper diagnosis before authorizing expensive component replacement.

Q: Will a P0950 code turn on my check engine light?

Yes. P0950 is a powertrain code that will illuminate the Check Engine Light (CEL) or Malfunction Indicator Lamp (MIL) on your dashboard. In some vehicles, a separate transmission warning light may also appear. The light will remain on until the fault is repaired and the code is cleared with an OBD2 scanner, or until the vehicle completes enough drive cycles without detecting the fault to self-clear the code.

Q: Can a bad battery or low voltage trigger a P0950 code?

Yes, a weak or failing battery, a faulty alternator, or corroded battery terminals can cause low or fluctuating system voltage that confuses the TCM and triggers false circuit codes including P0950. Before replacing any transmission components, check your battery voltage (should be 12.4–12.7V at rest) and have the charging system tested. Clean battery terminals thoroughly and retest to rule out electrical system issues as the root cause.

Abstract

The P0950 error code indicates a fault in the Auto Shift Manual (ASM) control circuit, which is the electronic system that allows your transmission to be manually shifted in vehicles equipped with an automatic transmission with manual-shift capability (such as tiptronic, paddle-shift, or manumatic systems). This code is triggered when the Transmission Control Module (TCM) or Powertrain Control Module (PCM) detects an abnormal voltage signal — too high, too low, or intermittent — coming from the shift control circuit. Left unaddressed, this issue can prevent manual gear selection from working correctly and may cause erratic shifting behavior or even limit your vehicle to a single gear.