DTC Detection Logic
WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.
The Engine Control Module (ECM) detected the after treatment DEF line heater relay driver signal was shorted to high source.
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DTC |
CONSULT screen terms (Trouble diagnosis content) |
DTC detection condition |
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P21C4-00 |
DEF HTR TEST TIME DEF HTR TEST TIMER DEF HTR TEST COUNTS Def tank heater test status |
Diagnosis condition |
This diagnostic runs when the ignition key switch is ON and line heating is commanded ON. |
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Signal (terminal) |
DEF line heater relay signal. |
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Threshold |
Urea heater relay driver signal is shorted to battery. |
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Diagnosis delay time |
- |
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