AutoCodes.com
Login with Google
AutoCodes – Generic – P1C54

P1C54 Code - SCR NOx Catalyst Missing

Quick Answer

The aftertreatment system is equipped with two Nox Sensors and modules. Common causes include Degraded, Diluted, or Incorrect Diesel Exhaust Fluid, Diesel Exhaust Fluid Deposit in the decomposition tube, Exhaust leaks. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1C54 indicates SCR NOx Catalyst Missing.
Common causes
Common causes include Degraded, Diluted, or Incorrect Diesel Exhaust Fluid, Diesel Exhaust Fluid Deposit in the decomposition tube, Exhaust leaks.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Save to My Repairs My Repairs
AI answers can be wrong. Verify repairs with testing. Open full chat
Code Popularity 12,197
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Mar 15, 2020
💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1C54 Description

The aftertreatment system is equipped with two Nox Sensors and modules. The upstream NOx Sensor 1/1 is located on the Turbocharger elbow downpipe and is permanently connected to a corresponding Nox Sensor Module mounted to the hot side of the engine block. The downstream NOx Sensor 1/2 is located at the outlet of the SCR Catalyst and is permanently connected to a corresponding Nox Sensor Module which is mounted on the right frame rail. The NOx Sensors and NOx Sensor Modules are calibrated to each other and must be replaced as an assembly. The two NOx Sensor and Module asemblies are not interchangeable. The NOx Sensor Modules are smart devices and communicate with the Powertrain Control Module (PCM) over the J1939 Data Link. The NOx Sensor Modules perform their own internal diagnostics and report malfunctions back to the PCM. The NOx Sensors are used to monitor the efficiency of the SCR Catalyst and dosing system. The PCM will illuminate the MIL lamp immediately after the monitor runs and fails. The PCM will turn off the MIL Lamp immediately after the monitor runs and passes.
OBDII Code P1C54 - SCR NOx Catalyst Missing - AutoCodes.com
P1C54 Code - SCR NOx Catalyst Missing
What does this mean?

What are the Possible Causes of the DTC P1C54?

  • Degraded, Diluted, or Incorrect Diesel Exhaust Fluid
  • Diesel Exhaust Fluid Deposit in the decomposition tube
  • Exhaust leaks
  • Malfunctioning Diesel Exhaust Fluid Dosing System
  • Malfunction SCR Catalyst

How to Fix the DTC P1C54?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1C54 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1C54 code?

Need more information on how to fix the P1C54 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1C54 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1C54 Code

What does the OBDII code P1C54 mean?

The OBDII code P1C54 indicates that the SCR (Selective Catalytic Reduction) NOx (Nitrogen Oxide) catalyst is missing or not detected by the vehicle’s engine control module.

What are the common symptoms of the P1C54 code?

Common symptoms include the check engine light being illuminated, reduced engine performance, increased emissions, and potential failure to pass emissions tests.

What could cause the P1C54 code to trigger?

Causes may include a physically missing or improperly installed SCR NOx catalyst, a malfunctioning sensor, wiring issues, or problems with the vehicle's emissions system.

How can I diagnose the P1C54 code?

To diagnose the P1C54 code, check for other related codes, inspect the SCR NOx catalyst and associated components for damage or disconnection, and test the wiring and connectors for continuity and proper operation.

Is it safe to drive a vehicle with the P1C54 code?

While it may be safe to drive, it is not advisable as the vehicle could experience reduced performance and increased emissions. It's best to address the issue promptly.

What repairs are typically needed for the P1C54 code?

Repairs may involve installing or replacing the SCR NOx catalyst, fixing any damaged wiring or connectors, or replacing malfunctioning sensors.

Can the P1C54 code affect fuel economy?

Yes, the presence of the P1C54 code can lead to decreased fuel economy due to improper combustion and reduced engine efficiency.

How can I clear the P1C54 code after repairs?

You can clear the P1C54 code using an OBDII scanner, or by disconnecting the vehicle's battery for a short period, but it's essential to ensure the underlying issue is fixed first.

Will the P1C54 code cause my vehicle to fail an emissions test?

Yes, the P1C54 code can lead to a failure in emissions testing, as it indicates a problem with the emissions control system that could increase NOx emissions.

Discuss the causes and fixes for P1C54 OBDII Code

Submit a New Comment
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play