P2DE2 Cold Start Fuel Injection Quantity D Lower Than Expected

P2DE2 reports that path D fell short of its fuel request during the cold-start strategy. On petrol direct-injection engines this phase is short and precise: GM's 2025 tables run catalyst heating with a split injection only while the catalyst is under 550 °C, coolant between -12 and 66 °C and the engine has run less than 20 seconds, and they check missing pulses separately under P2B95. CARB section 1968.2 (e)(11.2.4) lists split or multiple injections among the features that must respond during the strategy. A pulse that opens but delivers too little, from deposits on the injector tip or a high-pressure pump slow to build pressure, would fit P2DE2. No manufacturer documents the code; P2DDE is the warm version.

Likely causes

Symptoms

• Check engine light on after a cold start
• Rough idle in the first seconds after a cold start
• Often nothing noticeable once warm

Repair estimate

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

Related codes

References: law.cornell.edu, gsi.ext.gm.com.