OBD-II trouble code
U0130: Lost Communication with Steering Effort Control Module
The network has lost the steering assist controller. This is the hungriest electrical consumer on the car during a parking manoeuvre, which means it can pull the voltage down far enough to knock itself off the bus — a fault that causes itself, and that appears exactly when assist matters most.
Quick facts
- System
- Network
- Category
- Network Communication
- Severity
- High severity
- Drivable
- Usually safe to drive short-term
- Repair cost range
- $130 – $1,500
- DIY difficulty
- Advanced DIY
Browse every code in U0100–U0186, or start from the full code library.
What does U0130 mean?
U0130 is set when another module on the network stops receiving messages from the steering effort control module — the controller that decides how much assistance the power steering provides, keeping the wheel light for parking and firming it up as speed rises.
The electrical fact that dominates this code is appetite. An electric power steering motor turning the wheels of a stationary car is, for those few seconds, the largest single current draw on the vehicle apart from the starter. That has a consequence unique to this module: it can starve itself. If the battery is aging, a terminal is corroded, or the main supply has a marginal joint, the voltage sag produced by the steering motor's own demand can drop the module below the threshold it needs to stay on the network — so it drops off, at full lock, in a parking space, and comes back a moment later. The complaint is then described as steering that goes heavy while manoeuvring and is fine on the road, which sounds like a mechanical fault and is actually a supply fault. Testing this code with a static voltage reading proves nothing. The measurement that matters is voltage at the module while the wheel is turned lock to lock with the vehicle stationary.
The way the symptom presents is also the inverse of most driver expectations, and it is worth explaining before anyone panics. Assist is not evenly useful across the speed range. At parking speeds the tyres are being scrubbed sideways against the road and assist is doing nearly all the work, so losing it makes the wheel dramatically heavier. At motorway speed the front tyres are rolling and steering inputs are small, so the same loss is barely noticeable. Drivers therefore report a car that seems fine on the way home and then feels like it has lost its steering entirely on the driveway. Nothing has changed between the two; only the amount of help that was being given.
Steering itself is not lost, and this is the reassurance that matters most. Electric assist works by adding torque to a mechanical column and rack that remain connected throughout, so with the module offline the car steers exactly as an unassisted car does — heavier, slower, requiring both hands and more planning, but entirely controllable. The danger is not that the car cannot be steered; it is that the change can arrive suddenly and surprise a driver who was expecting assistance. Where the module sits also matters for diagnosis: on or near the column and rack, in the bulkhead area where scuttle drains discharge, so water finding its way into that connector is a realistic cause.
Common causes
- Aging battery unable to hold voltage under the steering motor's peak demand
- Corroded battery terminal or main supply joint sagging under load
- High-resistance connection in the module's heavy-current supply cable
- Poor or corroded ground on the high-current return path
- Water entering the module connector from a blocked scuttle drain
- Blown fuse or fusible link in the steering assist supply
- Chafed bus wiring where the harness passes the column or bulkhead
- Connector damage from work behind the dashboard or on the column
- Failed internal communication circuitry in the module
- Charging system output falling short of what the steering demands at idle
Symptoms
- Power steering warning light on
- Steering going heavy while parking, then normal again on the road
- Assist dropping out at full lock and returning a moment later
- Wheel dramatically heavier at walking pace and barely changed at speed
- Fault appearing more often with an old battery or in cold weather
- Speed-sensitive steering no longer firming up as speed rises
- Assist loss coinciding with headlights dimming or other electrical dips
- Scan tool unable to reach the steering effort control module
- Fault first noticed on a driveway or in a car park rather than while driving
- Steering still fully connected and controllable, only much heavier
Diagnostic steps
- 1.Measure voltage at the module while turning the wheel lock to lock with the vehicle stationary, since a static reading will look perfectly healthy.
- 2.Load-test the battery and check charging output at idle, because this module's demand exceeds what a tired system can hold up.
- 3.Clean and torque the battery terminals and main supply joints before condemning anything electronic.
- 4.Perform a voltage drop test on the heavy supply cable and its ground return while assist is being demanded.
- 5.Ask specifically when the assist is lost — parking versus driving — because the answer separates a supply fault from a bus fault.
- 6.Scan all modules and confirm this one is unreachable while the rest respond.
- 7.Check the scuttle drains above the module and look for water tracking into the connector.
- 8.Inspect the harness where it passes the column and bulkhead for chafe, and flex it while monitoring.
- 9.Measure the bus lines at the module connector and verify continuity back toward the network.
- 10.Only after supply, ground and battery are proven under load should the module itself be considered, since replacement needs programming and often a steering angle calibration.
Repair cost
$130 – $1,500
A blown fuse, corroded ground, or connector repair is the cheapest fix at $130-$400 once located. Wiring repair runs $200-$650. Diagnostic time often adds $100-$200. Replacing and programming a steering effort / power-steering control module is the most expensive outcome at $700-$1,500 or more (and far higher if it is integrated into the steering rack), and is a last resort after wiring, power, and ground are ruled out.
Estimate your repair
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Open the Repair Cost Estimator with steering angle sensor service preselected. Adjust labor rate and vehicle category to fit your situation.
DIY vs shop
This is an advanced DIY job. It typically requires specialty tools, scan-tool access, lifting equipment, or careful sequencing to avoid causing new failures. Plan for extended downtime and have a backup vehicle. Most owners are better served by a shop that has done this repair before.