U1157

Severity: Low

SCP (J1850) Invalid or Missing Data for Digital Signal Processing

Last updated: July 2026

System

Network

Subsystem

Network Communication

Code Type

Manufacturer-specific

What does U1157 mean?

U1157 is a manufacturer-specific network diagnostic trouble code. It is defined as "SCP (J1850) Invalid or Missing Data for Digital Signal Processing". It falls under the network communication area of the vehicle’s network system, and its exact meaning can vary between manufacturers.

When is U1157 set?

The affected control module sets U1157 when it detects a condition matching "scp (j1850) invalid or missing data for digital signal processing" in the network communication circuit or system. When the fault is confirmed, the module stores the code and, in most cases, turns on a warning light.

This code is generally minor and often relates to a signal, range or performance condition. It should still be inspected, especially if it returns after clearing.

Common symptoms

Multiple unrelated warning lights at once
Features that depend on module communication stop working
Intermittent electrical faults
Gauges or displays behaving erratically

Possible causes

A damaged or corroded connector on the communication bus
Wiring faults (open, short or high resistance) on the CAN/data lines
A module that has lost power or ground
A failing control module on the network
Low battery voltage disrupting communication

What to check first

Scan every module and note which ones report the communication fault
Check battery voltage and charging system first
Inspect the data-bus wiring and shared connectors for damage
Look for a single module that has lost power or ground
Isolate modules to find the one disrupting the bus

Frequently asked questions

What does the U1157 code mean?

U1157 means "SCP (J1850) Invalid or Missing Data for Digital Signal Processing". It is a manufacturer-specific network trouble code in the network communication area.

Is it safe to drive with a U1157 code?

This code is usually minor, and short-distance driving is often possible, but you should still have it checked — especially if the warning light stays on or the code returns.

How do I fix a U1157 code?

There is no single fix. Start by confirming the code with a scan tool, then work through the likely causes and checks above — inspecting wiring, connectors and the relevant components before replacing any parts. On your specific make, confirm the diagnosis before repairs.

Can I clear the U1157 code myself?

You can clear the code with an OBD-II scan tool, but if the underlying fault is still present it will usually return. Clearing without repair is only useful to confirm whether the fault is active.

Related codes

U1158

SCP (J1850) Invalid or Missing Data for Antenna

U1159

SCP (J1850) Invalid or Missing Data for Antenna

U1156

SCP (J1850) Invalid or Missing Data for Digital Signal Processing

U1160

SCP (J1850) Invalid or Missing Data for Primary Id

Important

This information is provided for general reference only. It is not repair advice and may not apply to every make or model. Manufacturer-specific codes can differ. Always confirm a diagnosis with a scan tool and, where needed, a qualified technician before replacing parts.