C0070 explained: The pressure sensor inside the ABS modulator that monitors traction control hydraulic pressure has failed or is shorted. ABS may still work, but TCS is disabled.
🎯 Top Causes & Probability
60%
#1 - Most Likely
Failed Pressure Sensor (Internal to Modulator)
Sensor is integral on most platforms. Modulator replacement or rebuild is required.
🔨 Part
$320-$900
👨🔧 Labor
$200-$380
⚡ DIY
Hard
24%
#2 - Check First
Wiring or Connector Issue
Corrosion at the modulator harness can mimic a sensor fault. Always inspect the connector first.
🔨 Part
$0-$40
👨🔧 Labor
$80-$160
⚡ DIY
Medium
12%
#3 - Less Common
ABS Module Driver Failure
Module input circuit fails. Module replacement or rebuild solves it.
🔨 Part
$300-$900
👨🔧 Labor
$120-$240
⚡ DIY
Medium
🚗 Most Affected Vehicles
🔧 Step-by-Step Diagnosis
- Disconnect and inspect the modulator main connector for corrosion.
- Back-probe the pressure sensor pins for voltage with key on, engine off.
- Compare measured voltage to the service manual spec, typically 0.5 to 4.5 volts.
- Replace the modulator if the sensor reads out of range with a known-good harness.
- Bleed brakes and clear codes after the swap.
❓ Frequently Asked Questions
Is the pressure sensor available separately?
On some GM and Ford trucks rebuilders offer just the sensor. Most other makes require the whole modulator.
Will base brakes work with C0070 set?
Yes. Only traction control and possibly ABS are disabled.
Why is this code so common on GM trucks?
Salt-belt corrosion plus heavy duty cycling stresses the modulator block and its internal sensor.
Can a brake bleed fix C0070?
No. It is an electrical sensor fault, not a hydraulic one.