C1170 Code: Meaning, Symptoms, Causes & Fix

Overview

Code C1170 indicates a fault in PRNDL Switch Circuit Failure, typically within ABS/chassis dynamics and brake control.

Symptoms

chassis warning indicator
reduced stability control performance
longer braking intervention

Common causes

Open circuit in wiring affecting prndl switch circuit failure
Broken terminal inside harness
Connector pin damage/corrosion or harness stress near related components

How to diagnose C1170

Confirm C1170 and capture freeze-frame data with a professional scan tool.
Inspect wiring, connectors, and grounds related to prndl switch circuit failure for obvious defects.
Use a continuity test from module pin to component to identify opens/high resistance.
Check for related DTCs to identify the root-cause chain before replacing parts.
After repair, clear codes and confirm readiness monitors complete without recurrence.

Severity of code C1170

Moderate: This code is moderate severity: the vehicle may still operate, but fault progression can increase repair cost over time.

Can you drive with C1170?

Most vehicles can be driven short-term with C1170, but postpone heavy load/highway driving until repaired.

If the warning lamp is flashing or drivability/safety is affected, avoid driving and diagnose immediately.

How to fix it (step-by-step)

Repair obvious wiring/connector faults first to prevent repeat parts replacement.
Address the root fault mode (open) in the prndl switch circuit failure circuit/system.
Apply the required relearn/adaptation procedure if specified by service information.
Road-test and verify C1170 remains cleared under the conditions that originally set the code.

Fix options

Repair open circuit and secure connector lock.
Clear corrosion and protect terminals.
Clear DTCs and verify with live data and completed drive cycle.

Typical repair cost

$240-$1200

Common mistakes when diagnosing C1170

Replacing parts without verifying voltage, ground, and signal integrity first.
Ignoring related stored/pending codes that indicate upstream faults.
Skipping post-repair verification drive cycle and readiness checks.

C1170 in common vehicles

C1170 appears across makes such as BMW, Mercedes-Benz, Audi, Volvo. Failure patterns differ by platform: wiring routes, software calibration, and component supplier revisions can change root cause.

Frequently asked questions

What causes C1170?

C1170 is commonly set by open faults affecting prndl switch circuit failure.

How much does it cost to fix C1170?

For C1170, repair costs are typically $240-$1200 depending on exact root cause, labor rates, and part quality.

Can I clear C1170 without repair?

You can clear C1170 temporarily, but the code usually returns until the underlying fault is corrected.