C1522 — Brake Pedal Travel Sensor Internal Power Supply Failure

OBD2 code C1522 flags a problem with the ABS / stability control (C1522 — brake pedal travel sensor internal power supply failure: causes, symptoms & fix). Short, gentle driving to a shop is usually possible. Common culprits: damaged tone (reluctor) ring on the hub, faulty ABS module or pump motor, damaged sensor wiring or corroded connector.

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Is it safe to drive?

Drive with caution The base brakes usually still work, so careful driving is possible — but ABS and stability control are disabled, which lengthens stopping distances on slippery roads. Fix promptly and avoid harsh driving.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm C1522 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many C0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the ABS / stability control for damage, corrosion, chafing or poor contact.
Subsystem check Read all four wheel speed PIDs while driving slowly — the faulty sensor drops out or reads implausibly.
Subsystem check Inspect the sensor and tone ring for metal debris and damage near the hub.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm C1522 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for C1522 (parts and labor, USD, independent shop rates): Replace a wheel speed sensor: $120–$350; ABS module repair or replacement: $400–$1,200; Repair sensor wiring: $80–$250. Overall, fixing C1522 usually costs between $80 and $1,200. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

What does OBD2 code C1522 mean?

What are the symptoms of C1522?

Drivers most often notice: stability control disabled message, speedometer or cruise control issues, ABS not operating during hard braking, ABS or ESC warning light on.

What is the most common cause of C1522?

The most common causes are: damaged tone (reluctor) ring on the hub, faulty ABS module or pump motor, damaged sensor wiring or corroded connector.

Will C1522 clear itself?

Sometimes C1522 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

How much does it cost to fix C1522?

Replace a wheel speed sensor — $120–$350; ABS module repair or replacement — $400–$1,200; Repair sensor wiring — $80–$250. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

C1522 — C1522 — Brake Pedal Travel Sensor Internal Power Supply Failure: Causes, Symptoms & Fix

The brake pedal travel sensor plays a quiet but critical role in your vehicle's safety systems. It measures how far you press the brake pedal and feeds that information to the ABS module, which then coordinates brake pressure during emergency stops and slippery conditions. When the control module detects an internal power supply failure within this sensor circuit, it logs trouble code C1522. This is not a reading error from a faulty signal — the module specifically identifies a problem with how it powers the sensor internally. Once the fault meets the manufacturer's defined criteria for repetition under specific driving conditions, the check engine or ABS warning light illuminates on your dashboard.

Understanding why C1522 triggers requires a look at how modern brake systems communicate. The ABS control unit expects consistent voltage and ground at the pedal travel sensor. When that internal power supply fluctuates, short-circuits, or drops out entirely, the module cannot trust the data it receives. Rather than guessing, it shuts down the affected functions, stores the fault, and freezes the operating conditions at the moment of failure. That freeze frame data — engine load, RPM, coolant temperature, and vehicle speed — gives you a precise starting point for troubleshooting. Replicating those exact conditions during testing makes diagnosis far more reliable.

Symptoms of C1522

When C1522 sets, you may notice one or more of the following:

A dashboard message indicating that stability control is disabled or unavailable
Intermittent or incorrect readings from the speedometer or cruise control system
ABS failing to activate during hard braking, even when you expect the system to pulse the brakes
The ABS or electronic stability control (ESC) warning light staying illuminated
Changes in brake pedal feel, including unusual pulsation or a different hardness compared to normal

Common Causes of C1522

The root causes, listed from most to least frequently encountered:

Wiring harness damage or connector corrosion at the ABS sensor circuits
A failed wheel speed sensor triggering related faults in the same module
A faulty ABS control module or pump motor assembly
A blown fuse or insufficient voltage supply to the ABS module
A defective brake pedal travel sensor itself

How to Diagnose C1522

Follow these steps to isolate the root cause before replacing any expensive components:

Connect an OBD2 scanner and confirm C1522 is stored in the ABS module. Save the freeze frame data, which records engine load, RPM, coolant temperature, and vehicle speed at the moment of failure.
Check for related trouble codes. Codes in the C0xxx range often share common grounds or power supplies. Also search for any factory Technical Service Bulletins (TSB) for your specific make and model using your VIN on the manufacturer's website or NHTSA.gov.
Perform a visual inspection of the wiring harness and connectors feeding the ABS and brake pedal travel sensor circuits. Look for chafed wires, broken insulation, corrosion buildup, or loose contacts.
Monitor the four wheel speed sensor PIDs on your scanner while driving slowly in a safe area. A failing sensor will drop out intermittently or display implausible road speeds.
Inspect the tone ring and sensor mounting at each hub for metal debris, damage, or improper spacing.
Clear the code and complete a full drive cycle, including the conditions captured in the freeze frame. If C1522 does not return, the issue may have been intermittent. If it recurs, proceed with targeted component testing.

Repair Options and Costs

Repair costs for C1522 vary significantly depending on which component is actually at fault:

Wheel speed sensor replacement: $120–$350
ABS module repair or replacement: $400–$1,200
Sensor wiring repair or connector replacement: $80–$250

Always start with the least expensive and most common causes — wiring issues and sensor failures — before considering module replacement. An accurate diagnosis before purchasing parts can prevent spending $1,200 on a new ABS module when a $150 wiring repair would have solved the problem.

Can You Drive with C1522?

Your base hydraulic brakes will continue to function, so you are not stranded. However, ABS and electronic stability control remain disabled until the fault is cleared. This means longer stopping distances on wet or icy surfaces and no automatic brake assist during emergency maneuvers. Treat this as a caution-level issue: drive carefully, avoid aggressive braking, and schedule the repair promptly.