OBD-II Diagnostic Trouble Code
C1429 — Stability Control Sensor Power Circuit
C1429 indicates a fault in the stability control sensor power circuit. The module saw the supply voltage to stability sensors such as the yaw and lateral sensors out of range. Definitions vary by OEM.
Severity 3/5
Truck-relevant
Service this week
Severity
Service this week
Stability Control Sensor Power Circuit
Code
C1429
Category
Chassis
Subsystem
Brakes
Truck-relevant
Yes
What this means for truckers
C1429 (Stability Control Sensor Power Circuit) — power feed to stability sensors fault.
Before you replace parts — try this first
C1429 on the Brakes system is most often short in sensor power wiring — not a dead part. On commercial diesels especially, work these in order before spending money on parts:
- Confirm the symptoms. Match what your truck is doing to the Symptoms section below. If the code is set but the symptoms are not there, clear the code and re-test after a drive cycle — it may not return.
- Clean and dry the sensor connector. Water, road salt, or oil seeping into a connector is the #1 fake sensor failure. Disconnect, look for green corrosion or moisture, spray with electrical contact cleaner, dry, reseat. Many faults clear here for $0.
- Inspect the wiring harness. Trace the wire from the sensor toward the ECM — look for chafing against the engine block, melted insulation near the turbo or exhaust, or pinch points where a clamp has rubbed through.
- Test the sensor before swapping it. Most Common Causes (below) list the expected voltage or resistance range — a $20 multimeter saves a $300 sensor swap that does not fix the problem.
- Only then, replace the part. Use the OEM or a tier-1 aftermarket. Cheap sensors throw the same code in two weeks.
Symptoms
Stability control and traction control lights on and disabled. ABS usually works. Multiple sensor codes may appear together.
Common causes
- CommonShort in sensor power wiring ($80–$350)
- OccasionalShorted sensor pulling down the supply ($300–$900)
- OccasionalBlown fuse ($10–$80)
- RareModule supply driver fault ($700–$2000)
How to fix
Check the fuse and supply voltage at the sensors
When to use: First step
Unplug sensors one by one to find a short
When to use: Supply pulled low
Repair wiring
When to use: Chafed harness found
Replace the module
When to use: No external short found
Affects most
No specific vehicle pattern found in our complaint database. This code can appear on any vehicle that supports OBD-II diagnostics.
Related
Frequently Asked Questions
Can I drive with code C1429?
C1429 is severity 3 — plan service within a few days. Performance is likely degraded already (you may feel reduced power, harsher shifts, or slightly worse fuel economy). Continuing to drive risks additional damage to adjacent components.
How much does it cost to fix C1429 on a commercial truck?
Total repair cost ranges $10–$2000 depending on the root cause. The cheapest fix is usually the first one listed below — Short in sensor power wiring — which is also the most common. On commercial trucks the cost is usually higher than passenger vehicles due to part availability and shop labor rates ($120–185/hour at most truck shops, vs $90–130 at general auto shops). DIY-capable fixes (sensors, hoses, filters) are at the low end; major component replacements (turbo actuator, high-pressure fuel pump, transmission solenoid pack) are at the high end. Always diagnose with a scan tool BEFORE replacing parts — guessing wrong on a $1,500 turbo actuator when the actual issue was a $30 boost hose is a common expensive mistake.
Will C1429 fail a DOT inspection?
C1429 is generally not a direct DOT inspection fail item by itself. Inspectors focus on safety-critical systems (brakes, steering, tires, lights, hours-of-service). However, the check engine light alone can trigger additional inspection scrutiny. Best practice: fix the code and clear it before a planned inspection.
What's the difference between C1429 and related codes?
C1429 is closely related to: C1417 (Brake Boost Vacuum Sensor Performance), C1418 (Brake Boost Vacuum Low). These codes share the same subsystem (brakes) and often appear together. If you see this code, scan for the full code list — fixing the root cause usually clears multiple companion codes at once. If only C1429 is set without the companions, the issue is more isolated.
How do I prevent C1429 from coming back after a repair?
For C1429 (Stability Control Sensor Power Circuit), prevention centers on the brakes system. Clean wheel speed sensors at every brake service. Inspect tone rings for cracks or rust. Keep ABS sensor harnesses away from chafe points. Don't drive through deep water that can flood the rear wheel-speed sensor connectors.