What Does U1018 Mean?
This code specifically indicates invalid or missing throttle position data on the SCP network. A module that requires throttle position information (like TCM or ABS) is not receiving valid data from the PCM/ECM.
Common Causes
35%
Failed throttle position sensor or accelerator pedal position sensor
25%
PCM/ECM failure to broadcast throttle data on SCP network
20%
Wiring issues between throttle sensor and PCM preventing proper signal
15%
Throttle body assembly malfunction with electronic throttle control system
5%
Network communication issue preventing PCM from broadcasting throttle data
Diagnostic Steps
1
Step 1: Monitor throttle position sensor data with scan tool during accelerator pedal movement (should show 0-100% smoothly)
2
Step 2: Check for throttle position sensor DTCs in the PCM (P0121, P0122, P0123, etc.)
3
Step 3: Inspect throttle body and accelerator pedal sensor connectors for corrosion or damage
4
Step 4: Test throttle position sensor voltage at PCM connector (typically 0.5V closed to 4.5V open)
5
Step 5: Verify PCM is receiving valid TPS signal and confirm SCP bus communication from PCM to other modules
Estimated Repair Cost
$100 - $800
Parts + labor, varies by vehicle and location
This code specifically indicates invalid or missing throttle position data on the SCP network. A module that requires throttle position information (like TCM or ABS) is not receiving valid data from the PCM/ECM.
The most common cause of U1018 (SCP (J1850) Invalid or Missing Data for Throttle) is: Failed throttle position sensor or accelerator pedal position sensor
Typical repair costs for U1018 range from $100 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Transmission may not shift properly or stay in limp mode. Throttle response may be limited or unpredictable. Vehicle is drivable but performance will be significantly reduced.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1018 to identify the root cause.
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Quick Info
Category
Network
System
Engine Control / Network Communication
Difficulty
Type
Manufacturer
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