3556/18 EPA10 DIESEL OXIDATION CATALYST OUTLET TEMPERATURE LOW

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EPA07/10/GHG14 DDEC VI/10 Electronics and Troubleshooting Manual (DDC-SVC-MAN-0084) | 372 SPN 3556 (ACM) (EPA10) | 372.2 SPN 3556/FMI 18 – EPA10

Description This code sets when the exhaust temperature does not increase above the modeled threshold when the low temp regeneration is enabled.
Monitored Parameter Diesel Oxidation Catalyst (DOC) outlet temperature sensor
Typical Enabling Conditions Low temperature regeneration enabled, 1100 to 2050 rpm, 50% to 100% engine load.
Monitor Sequence None
Execution Frequency Continuous When Enabling Conditions Met
Typical Duration 20 seconds
Dash Lamps MIL, CEL
Engine Reaction None
Verification Low Temp Regeneration

Check as follows:

    1. Connect DiagnosticLink® . Go to step 2.

    1. Turn the key ON (Key ON, Engine OFF). Go to step 3.

    1. Check for multiple codes. Are there DOC outlet temperature sensor stuck fault codes or DOC outlet temperature sensor circuit fault codes present?
        1. Yes; diagnose the other fault codes first. Verify repair.

      1. No; Go to step 4.

    1. Are there any Hydrocarbon (HC) doser low pressure fault codes present?
        1. Yes; diagnose HC doser low pressure fault codes first. Verify repair.

      1. No; Go to step 5.

    1. Perform the low temperature Aftertreatment Device (ATD) regeneration; Go to step 6.

    1. After the low temp ATD regeneration has run for 20 minutes, monitor the DOC outlet temperature sensor reading. Is the DOC outlet temperature sensor reading within 25°C (45°F) of the other exhaust temperature sensor readings?
        1. Yes; Go to step 7.

      1. No; replace the DOC outlet temperature sensor. Verify repair.

  1. Visually inspect the exhaust system for leaks. Are there exhaust leaks present?

      1. Yes; repair the exhaust leaks. Verify repair.

     

    1. No; replace the HC doser block. Verify repair.

2 thoughts on “3556/18 EPA10 DIESEL OXIDATION CATALYST OUTLET TEMPERATURE LOW”

  1. Kevin

    This is the code I’m getting low voltage outlet temp sensor. I replaced sensor but light is still on. If that was the issue will my truck still regen and once ecm notices a good sensor should light then go out?

  2. Mechanic Post author

    Try a regen first, and the light will go away if the sensor was the issue. And if it doesn’t clear the code with a laptop and do a forced regen.

    finally if that doesn’t work you have a rubbed wiring in the harness some where. I have the diagrams posted on the site.

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